1. Introduction 2. Why play Galio? 3. When to pick Galio? 4. Pros/Cons 5. Summoner Spells 6. Runes 7. Aftershock or Predator on Galio? 8. Abilities

9. Skill Sequence 10. Items 11. Early Game 12. Mid Game 13. Late Game 14. Combos/Tricks 15. How to farm 16. Warding

17. Roaming 18. Playing from behind 19. Matchups in Mid Lane 20. Matchups as Support 21. Synergies 22. Synergies with ADC as Support 23. What to ban? 24. Conclusion

Hello everyone and welcome to "My Galio's Build" guide. I am EUNE League of Legends player and my name in game is Hektor Ulmer (not my real life name, it's just what I added). My rank in other account was Diamond III, but I can't really remember my old account name because I took a break from the game for a several years but I really don't mind that and now I created new account to play for fun and not to be the best player in the game. My favourite champion in game is Viktor, but I also love to play many champions especially in Mid lane. I play many roles but my best role is Mid and Top lane. From that being said, I am going to show you why Galio is anti-mage tanky champion is fun to play. If you don't wanna read my guide and if you are only interested on items, that is fine for me because I created this guide for any players who mains Galio to get better in ranked or to play him just for fun. :)

Abilities

Galio - The Colossus Melee Anti-Mage Champion Damage Type: Magic Mid Lane: Great Difficulty to play: Normal Galio is a tanky anti-mage champion that does well against most of the champions that deals magic damage and can tank enough their magic damage thanks to your Shield of Durand. He has a good waveclear with his Winds of War and Colossal Smash which makes him hard pusher and he will eventually make the enemy opponent farm under their tower. He also has an excellent gank setup with Justice Punch and Shield of Durand which makes the enemy champion Flash away or die. Finally, his ultimate Hero's Entrance makes him a perfect roaming champion and can quickly follow their enemy roams fast. If you are well farmed and have some defensive items, there is not much the enemy opponent can do to you unless if they are very fed. From my experience, let me show you why Galio is a fun champion and how to play him properly.

You can pick Galio whenever you are comfort to play with. He does well in every elo. It is not advice to pick him as a first pick before the enemy player can pick something that can counter you.

If you see that the enemy player has picked like Akali, Fizz, Lissandra etc. then you can safely pick Galio as he does really well against them due to your tankiness and roaming potential. Just be careful, one mistake can make your lane lost.

Any other ranged mage champions like Ahri, Annie, Malzahar etc is also good pick as you can tank their magic damage and push your lane forcing them to farm under their tower. Immobile mages cannot follow your roams due to your Hero's Entrance. Just don't let them poke you for free and you should be fine.

However, if you see that the enemy player has picked Irelia, Yone, Zed or any other champions that deals a lot of psyhical damage then do not pick Galio unless if you are very professional player with him. These AD champions are pretty much nightmare for Galio since he is an anti-mage champion that works well against a champions who deals magic damage only but he is terrible against AD champions. So try your best to avoid pick Galio if you see them. If you first picked Galio and they picked a champion that counters, then do your best to farm safely, roam other lanes and try to win the game as soon as possible.

Pros +He is an anti-mage champion that does really well against a lot of mages +Can negate a lot of magic damage with his Shield of Durand +Has an AoE damage and AoE CC +Good waveclear with his Winds of War and Colossal Smash +Great at gank setup with his Justice Punch and Shield of Durand +Great at roaming thanks to his Hero's Entrance +Quite tanky champion and hard to kill once you have few items +Does really well in teamfights +Very underrated and low ban rated champion Galio is a tanky anti-mage champion that can do well against a lot of mages thanks to his Shield of Durand. He can push really hard with his abilities, forcing their enemy champion to farm under their tower. He also has a great gank setup with his Justice Punch and Shield of Durand and can roam very effectively with his Hero's Entrance. On the top of the that, he does really great in teamfights thanks to his CC and he is almost never banned in draft modes.

Cons -Can be somehow poked down easily -Mana hungry early if he spams a lot -Bad against AD champions -Missing your Justice Punch can lose your trade -Vulnerable when his abilities are on cooldown -His Hero's Entrance can only target on ally champion -Can be bad if he is behind -Not the best scaling champion in the late game -Very unpopular champion (he is low picked) Unfortunately, he has a lot of weakness like any other champions. He doesn't do well against AD champions as his Shield of Durand is only effective against magic damage. If he misses his abilities on the enemy, he will lose trades and the enemy can take him down. His ultimate Hero's Entrance can only target on the ally champion meaning you can't cast anywhere like any other champions who has global ultimate. If the enemy player has managed to kill Galio few times, he can be pretty useless in the late game and he won't be able to do much damage.

FLASHFlash is the most important spell in the game. It helps you from escaping nasty situations and also for chasing and killing enemies whenever you can't reach them. Always take this every game!

TELEPORTTeleport is very good summoner spell on Galio. It can be used to teleport on allied towers and it has a 360 seconds of cooldown. After 14 minutes, you can cast on allied minions, wards, towers and other allied constructs and has a 240 seconds of cooldown. This is where you should take on most of the games.

IGNITEThis is a summoner spell where you wanna play aggressive for having kill pressure against champions who has a weak early game or against a champions that heals a lot such as Sylas, Vladimir etc. It helps you to get an early kill especially if you have started with Dark Seal. Take this if you are planning to go aggresive.

EXHAUSTThis spell helps a lot against champions who is assassin or who does a lot of damage with auto attacks such as Yasuo, Yone etc. Having Exhaust makes great 1 vs 1 dueling but take this spell only if your ADC or Support doesn't have.

GHOST Ghost is another viable option for Galio. This can be good if you wanna to catch your enemies with Shield of Durand. I would take this if the enemy team has a lot of escaping tools where you can't catch them that easily.

Keystone Aftershock is really great Rune for Galio. After you immobilize an enemy champion, you will gain bonus Armor and Magic Resist for 2.5 and after that, you will deal bonus magic damage to nearby enemies. This Rune really works well with Justice Punch and Shield of Durand where you will be able to trade the enemy champion effectively. This is where you are going to use this Rune in most of the game. Tier 1 Shield Bash is extremely good on Galio due to your magic shield from Shield of Durand. With this Rune, you will gain small amount of Armor and Magic Resist while shielded and when you gain a new shield, your next basic attack on the enemy champion will deal bonus damage. This works really well together with Colossal Smash. Tier 2 Bone Plating is good especially against melee champions where you can reduce their damage from spells or attacks. This is where you take in most of the games if the champion isn't heavy poking. Tier 3 Overgrowth is really good on Galio. With this rune, your health will grow when the game goes on and you will be eventually tanky in the mid/late game. Tier 1 Nimbus Cloak is good on Galio. With this after casting a Summoner Spell, you will gain a short Movement Speed and can pass through minions. Tier 2 Transcendence gives you cooldown reduction upon reaching levels. Having lower cooldowns means you can spam more abilities very often. Take double [ Adaptive for early damage and better farming minions with your abilities. For defense, take magic resist AP matchups. Same goes from above but with armor against AD matchups. This is where you wanna take double magic resist against hard AP matchups where you are going to get bullied a lot. This is where you wanna take double armor against hard AD matchups especially against assassins where they can burst you down quickly such as Zed. If you are not sure who is going to be your opponent in mid lane for example if their enemy team has Ekko and Irelia and one of them can be mid, then take for defense health. If you are against a champion that will poke you a lot, then this Rune page will help you: Tier 2 Second Wind is a must have against heavy poking champions that will constantly harass you a lot. With this Rune and/or Doran's Shield you will stay healthy in your lane for much longer. Tier 3 Unflinching is good on Galio especially if the enemy team has a lot of CC. With this Rune, you will be able to reduce their CC duration and even more the lower your health is. Tier 1 Manaflow Band is great for any mages especially on Galio. When fully stacked, you gain permamently 250 bonus mana and passive that restores 1% of missing mana every 5 seconds. If you are against an easy matchup especially if the enemy champion has no kill pressure on you, then you can take this Rune page: Tier 2 Conditioning is very good on tank especially on Galio. With this Rune, you will gain Armor and Magic Resist after 9 minutes and you will be much more tankier than usual. Tier 2 Gathering Storm is good when you want more damage in the late game. It's pretty weak early but later it will become much stronger and you will be able to deal much more damage. There are also another viable Keystone Runes that works well for Galio but a lot of players don't usually take it since they mostly take either Aftershock or Predator. First, I will show you for Inspiration, then after that, Sorcery: Keystone Unsealed Spellbook is an another option Keystone Rune for Galio. With this, you will be able to swap your Summoner Spell after 6 minutes in game. Each Summoner Spell swap will reduce the cooldown of swap. Very good and underrated Keystone Rune for many champions especially if you take Teleport. It's also good to have against some long ranged champions or even harder lanes. For Tier 1, take one of these depending on matchup: Tier 1 Magical Footweargives you free boots at 12:00 and for every takedown, it reduces cooldown by 45 seconds. This is great where you don't have to spend 300 gold in shop but keep in mind that you cannot buy boots before then. Tier 1 Perfect Timing is good when you don't wanna waste 650 gold in shop and each takedown reduces your timer. This is viable against matchups such as Fizz, Zed etc. to avoid their ultimates. For Tier 2, take Future's Market to buy your Items faster or Minion Dematerializer to instakill minion or Biscuit Delivery for a better sustain: Tier 2 Future's Market is very good and pretty strong Rune since you can buy Items early even if you don't have much that gold. The amount of gold increases over time. Tier 2 Minion Dematerializer gives you 3 Items that permamently kills any minion. This Rune is quite good for those who wants to delete it and push their lanes hard. Use it on Cannon minion since it has large HP and gives you much gold. Tier 2 Biscuit Delivery gives you every 2 minutes until 6 minutes (max 3). It restores health and mana and the lower you are, it restore much faster. Consuming or selling gives permamently increase your mana cap by 50 which is really nice for any champions who struggles with mana. Tier 3 Cosmic Insight gives you cooldown reduction from your summoner spells and items which is really good as you can activate earlier than usual. This is a Keystone Rune for Sorcery (other Sorcery Rune is explained from above): Keystone Phase Rush is very good especially if you want to short trade with your opponent. It gives you bonus Movement Speed when dealing damage to champions with attacks or abilities. Also, gives you Slow Resistances which is very effective against perma slow team. If you are planning to roam a lot and/or if you don't wanna to use Aftershock or other viable Keystone Runes for Galio, then you can take this Rune page (it's no longer viable due to changes): Keystone Predator is extremely good on roaming champions such as Galio. With this Rune, you will be able to chase the enemy champion much faster. Keep in mind that you need boots to activate the Predator and it cancels it once you have dealt damage with an ability. Tier 1 Taste of Blood heals you when you damage and enemy champion. Tier 2 Eyeball Collection: Each enemy champion takedowns, you collect eyeballs for AD or AP. Tier 3 Ingenious Hunter is very good to reduce your CD on your activateble items especially on trinkets. Combining together with Predator, you will activate it even more than before. Tier 1 Waterwalking gives you bonus movement speed and damage when you are on river. This is very good when you are going to roam on other lanes when you have Predator. Tier 2 Celerity gives you movement speed effect on any source. It really works well with your Predator and other movement speed items as well.

AFTERSHOCK

VS

PREDATOR

So people are asking which rune is best in Season 12 on Galio. Aftershock or Predator? A lot of people are taking Predator because you can chase the enemy champion and catch them easily especially if you are going to roam a lot at other lanes. Without Predator, you won't catch enemies easily. Aftershock gives you armor and magic resist when you immobilize an enemy champion and after a few seconds, you will deal magic damage to surrounding enemies. This gives you a lot of more tankiness than Predator and it's very good to trade your opponent well (if you don't miss your abilities of course). So which should you pick? Let's see first what these 2 Rune Keystones actually do:

AFTERSHOCK

PASSIVE: Immobilizing an enemy champion grants a static 35 (+ 80% bonus armor) bonus armor and 35 (+ 80% bonus magic resistance) bonus magic resistance for 2.5 seconds. The bonus resistances are capped at 80 − 150 (based on level). After the duration, you release a shockwave that deals 25 − 120 (based on level) (+ 8% of your bonus health) magic damage to nearby enemy champions and monsters. Cooldown: 20 seconds

PREDATOR

PASSIVE: Boots gain the active effect PREDATOR. ACTIVE - PREDATOR: After a 0.25-second cast time, gain bonus movement speed for 10 seconds, ramping up to 25%-50% over 1 second, while moving toward enemy champions within 3000 units. After ramping up, your next damaging basic attack or ability against an enemy champion deals 20 − 180 (based on level) (+ 25% bonus AD) (+ 15% AP) bonus Adaptive damage after a 0.25-second delay and ends the effect. Cooldown: 120 − 60 (based on level) seconds Range: 3000

As you can see, these 2 Rune Keystones are different. Aftershock is very good for those who wants to reduce their enemy damage and to deal damage to all nearby. It's very good especially if you are trading against melee champions or a mage who is immobile. It has pretty low cooldown at only 20 seconds.

However, Predator is very good for those who wants to roam a lot. Galio benefits on roaming so taking Predator can help you a lot to chase enemy champions and if he manages to catch them, he will get easy takedown. The downsides is that it has a long cooldown and it only deals bonus damage only with a one attack or spell where it ends Predator.

Both of these Rune Keystones are very good on Galio. Aftershock is good for trading while Predator is good for roaming. Which one is better? It is up to you. I personally take Aftershock to increase my defense. I don't usually take Predator a lot. You can try these Rune Keystone what suits you and use it which one do you like.

Colossal Smash (Passive) RANGE: 150 COST: N/A COOLDOWN: 5

INNATE: Galio's next basic attack is periodically modified to deal 15-200 (based on level) (+1.0 per attack damage) (+50% of ability power) (+60% of bonus magic resistance) magic damage to its target and all enemies around it.

Winds of War (Q) RANGE: 826 COST: 70/75/80/85/90 COOLDOWN: 12/11.5/11/10.5/10

Galio fires two gusts of wind that arc to either side before converging to the target area, dealing 70 / 105 / 140 / 175 / 210 (+75% of ability power) magic damage to all enemies they pass through. When the blasts meet, the gusts form a tornado that advances for 2 seconds, dealing 2.5% of target's maximum health (+1% per 100 ability power) as magic damage every 0.5 seconds to every enemy within, with the target's health ratio capped at 150 damage against monsters.

Shield of Durand (W) RANGE: N/A COST: 50 COOLDOWN: 18/17.5/17/16.5/16

Passive: Upon learning Shield of Durand or after not taking damage for 12 seconds, Galio gains Anti-Magic Bulwark. Anti-Magic Bulwark: Gain a 7.5 / 9 / 10.5 / 11 / 13.5% of maximum health shield that absorbs magic damage. First Cast: Galio begins to charge for up to 3 seconds, slowing himself by 15%, reducing incoming magic damage by 20 / 25 / 30 / 35 / 40% (+8% per 100 bonus magic resistance) (+5% per 100 ability power), reducing incoming physical damage by half that amount, and increasing Shield of Durand's taunt radius over the duration. Galio cannot use Flash while channeling Shield of Durand. Second Cast: Galio taunts all nearby enemies for 0.5-1.5 seconds and deals between 20 / 35 / 50 / 65 / 80 (+30% of ability power) and 60 / 105 / 150 / 195 / 240 (+90% of ability power) magic damage to them (based on charge time), while also refreshing the damage reduction for 2 seconds.

Justice Punch (E) RANGE: 250/650 COST: 30/35/40/45/50 COOLDOWN: 12/11/10/9/8

Galio briefly dashes backwards before charging forwards, stopping upon hitting terrain or an enemy champion, dealing 90 / 130 / 170 / 210 / 250 (+90% of ability power) magic damage to all enemies hit and knocking them up for 0.75 seconds. Deals 50% reduced damage to non-champions.

Hero's Entrance (R) RANGE: 4000/4750/5500 COST: 100 COOLDOWN: 200/180/160

Galio designates the target allied champion's location at the time of cast as his landing spot, granting Shield of Durand's passive magic damage shield to all allied champions in the area he casted it at for 5 seconds, and channels for 1.25 seconds. Galio then becomes untargetable and dashes to them, becoming cc-immune briefly and dealing 150 / 250 / 350 (+70% of ability power) magic damage to all nearby enemies on impact and knocking them up for 0.75 seconds.

You should start at lvl 1 Winds of War in almost every single game. At lvl 2, put point in Shield of Durand to gain magic shield then at lvl 3 Justice Punch. Max first Winds of War as it it his main damage and waveclear ability. Then after that, max Shield of Durand to increase your magic shield and damage and then max last Justice Punch as it only knocks up and it doesn't increases the duration. At lvl 6, 11 and 16, always put point on Hero's Entrance.


In some case, you want to max Shield of Durand first instead of Winds of War against harder AP matchup or if you want to tank their magic damage in general. In this way, you will be able to survive their magic burst and they will not be able to kill you that easily.

Starting Items:

DORAN'S RING A standard item for most of the mages. It gives you Aility Power, Health and a passive that restores mana when you damage and enemy champion. This is where you should start in most of the games.

CORRUPTING POTION Another viable start especially if you are against melee champion. With this start, you will stay in your lane for much longer especially if you take Rune Time Warp Tonic. You should start wit this if you are against harder matchups or if you need sustain in general.

DARK SEAL This starting item is good for those who wants to stack AP or if you are thinking you will have an easier matchup. Later, you can upgrade it into Mejai's Soulstealer if you have a lot of stack but don't upgrade it if you didn't manage to have takedowns or if you have died a lot.

DORAN'S SHIELD Some players asks why start Doran's Shield. Sure, maybe it looks like a wierd start on Galio but this item is good on any tanks especially on him since he is also a tank. This item is very good against heavy poke champions who will constantly harass you with auto attacks or with single spell. It gives you health and health regeneration after taking damage from a champion. You don't have to start with this item but it's great against a champions who will poke you a lot.

BOOTS Only start with Boots if you are going to take Rune Predator. With this item, it will help you to roam other lanes faster and even perhaps you can get early kills and snowball.

RELIC SHIELD If you are playing as Support, you need to start with this Item. Every tanky Support has to start with this to passively gain gold and to execute minions to gain permament gold to you and your ally. Always keep it in your inventory as you will always ward somewhere once this Item is upgraded at least once.

STEALTH WARD You must ALWAYS start with Stealth Ward. It reveals surrounding area so you can see on the map if the enemy junglers comes to gank you or if enemy mid laners goes roaming. Later after the enemy or your tower in mid lane is destroyed you can keep it or you can buy Farsight Alteration or Oracle Lens depending what the enemy team comp looks like.

First Recall:

LOST CHAPTER This item is very important for any champions who deal a lot of magic damage. It gives you Ability Haste, AP, Mana and restores your mana when you lvl up. Buy it i you didn't struggle in your lane.

SEEKER'S ARMGUARD If you are facing against AD champions especially against harder matchups, then get it to survive their burst. With this item, you will be able to reduce their psyhical damage and they will have a hard time to kill you unless if they are ahead. Later upgrade it into Zhonya's Hourglass.

VERDANT BARRIER If you struggle against AP champion or if you wanna reduce their magic damage, then buy it first. This item will help you especially if the enemy team deals a lot of magic damage. Later upgrade it into Banshee's Veil.

CATALYST OF AEONS This item is back like Rod of Ages. It gives you nice amount of health and mana. Consider to buy this only if you are going to build Rod of Ages as Mythic item.

LIFEWELL PENDANT If you have enough 1050 gold, buy this Item so you can get your Mythic Item much faster. If you don't have that much gold, then buy at least Ruby Crystal and/or Cloth Armor.

CONTROL WARD Buy this often when you are going to recall. It will help you to reveal location and invisible wards so you can clean them. This also reveals invisible champions such as Twitch. Put it in the bush near enemy red buff, players often don't see there.

Mythic Items:

EVERFROST This Mythic Item is very good on Galio. It gives you AP, Ability Haste, Health and Mana. With this item, you will be able to catch the enemy champions easily. This is because of your Justice Punch since you can dash them and then you can activate your Everfrost to root them and then activate Shield of Durand to taunt them which makes them impossible to escape. This is where you should build in most of the games especially if the enemy team has a lot of dashes such as Irelia, Yasuo etc.

HEXTECH ROCKETBELT Another viable Mythic Item especially if the enemy team is stacking a lot of Magic Resist. Unlike Everfrost, it doesn't give you Mana instead it gives you a small Magic Penetration. You can activate it for a dash to deal magic damage and afterwards, you gain Movement Speed while moving towards enemy champions. You should buy this Item if the enemy team is tanky or if you wanna more AP for damage.

NIGHT HARVESTER Only buy this if you are fed or if the enemy team is squishy and doesn't have any bruisers or tanks. With this Item, it does really high amount of damage and gives you Movement Speed.

ROD OF AGES Rod of Ages is back for beloved players! This item is currently strong right now. It gives you Ability Power, Health and Mana and each minute it increases your Ability Power, Health and Mana up to 10 times. After reaching max stacks, you will gain a level and it will improve your other passive that restores your Mana and Health upon taking damage from champions. This item is very good for many mages and AP bruisers but the downsides it slowly scales in late game. It's great Mythic item for [[Galio] since he is really tanky and he loves tanky defensive stats.

Boots:

SORCERER'S SHOES These boots are very solid choice for any mages. Buy those if you need Magic Penetration and you didn't struggle agains your opponent.

MERCURY'S TREADS These boots are also viable for Galio. It helps you to reduce their magic damage and reduce the CC duration. Buy this if you struggle against hard AP champion.

PLATED STEELCAPS If you are facing against AD champion, then this boots is good to go. It helps you to reduce their physical damage. Buy it when the enemy team doesnt have a lot of CC and deals mostly AD damage.

IONIAN BOOTS OF LUCIDITY Quite good for CDR. With these boots, you will be able to spam your abilities a lot. Buy this if you are confident.

MOBILITY BOOTS If you are playing as Support and you want to roam a lot in other lanes to help your allies, then these boots will help you to gain speed.

Core Items:

ZHONYA'S HOURGLASS This item is important for Galio especially if you are facing an AD champion. It gives you Ability Haste, AP, and Armor. It has an active that you can become untargetable which you can avoid a lot of nasty situations. This is where you buy this Item in almost every single game.

COSMIC DRIVE This item now gives you much better Ability Power, Ability Haste and gives you better passive. It gives you bonus Movement Speed when you deal damage to the enemy champion, maximum at 4 stacks and at final stack, you will gain an additional bonus Movement Speed. This will refresh when you deal damage.

DEMONIC EMBRACE You should buy this only if the enemy team has a lot of Tanks especially if they stack a lot of Health. This item gives you AP, Health and you gain even more AP when you have more Health. It also burns the enemies when you deal damage to them with abilities.

RABADON'S DEATHCAP You should buy this as a last item to increase your Ability Power so you can deal more damage with your abilities. If you are very fed, then you can buy this Item earlier to snowball hard.

VOID STAFF You should buy this Item as a last 6th Item. It gives you bonus Magic Penetration which ignores enemy Magic Resist which helps you to deal more damage.

BANSHEE'S VEIL This item is very good on Galio especially if you are facing against AP champion. It will help you to reduce their magic damage and has a spellshield that blocks one ability every 40 seconds. You should buy this if the enemy team has tons of CC and has most AP champions.

Situational Items:


Damage Items:

LIANDRY'S ANGUISH This Mythic Item can be situational if you are up against many tanks. It burns them to deal damage based on max Health. I don't buy this as a Galio player but it can be good especially if you combine together with Demonic Embrace.

MORELLONOMICON This item is good if their enemy has a lot of healings or if you are facing against healing champions such as Sylas, Vladimir etc. Buy this if your team doesn't have any antiheals.

RYLAI'S CRYSTAL SCEPTER I think this item is underrated for Galio as you will be able to slow your enemies with your abilities and they will have a hard time to escape from you. Not a bad situational item.

SHADOWFLAME This item is good especially if the enemy team has a bruiser or tank and they have a lot of shields from abilities or items. Buy it if you want to deal more damge and you need more Health and AP.

MEJAI'S SOULSTEALER An upgraded item from Dark Seal if you snowball really hard. Not reccommended to use in ranked games unless if you are very professional player with Galio.

Defensive Items:

THORNMAIL If you want to tank their AD damage or if the enemy team is full of AD, then this item is good to go. Since Galio is a mage but also a tank, this item benefits on him. Buy it if your team doesn't have any bruiser or tank.

FROZEN HEART If the enemy team does a lot of physical damage and they only deal damage that reliaze on auto attacking a lot, then this Item will help you a lot. It's really strong Item so you should defenitely buy it when you are playing as Support.

RANDUIN'S OMEN Similar to Thornmail if the enemy team is full of AD, this item can help you a lot. It's also really good against who only uses too much auto attacks suc as Master Yi, Tryndamere etc.

DEAD MAN'S PLATE Really good Item since it's good against AD champions and it helps you to chase enemy champions faster. You should buy this as Support if the enemy team has a lot of kiting potentional where you can't engage that well.

FORCE OF NATURE This item benefits on Galio. You should buy this item if the enemy team is full of AP and doesn't do a lot of AD damage or if you wanna to tank their magic damage. This item also has a passive that gives you bonus movement speed and reduces incoming magic damage.

ABYSSAL MASK This item has been reworked recently and now it's very good Magic Resist item especially against AP team. You should buy if the enemy team deals mostly a lot of magic damage and also if they stack Magic Resist since this item has a passive that curses enemy champions, reduces their Magic Resist when you are nearby enemy champions. Also, you gain bonus Magic Resist for each enemy cursed.

SPIRIT VISAGE Great Magic Resist Item especially if you are against fully AP enemy team. It helps you to increase your Health more from any sources and you gain more shield from your Shield of Durand.

TURBO CHEMTANK A good Magic Resist Item that you can activate it to gain bonus Movement Speed and ghosting through your minions while moving towards towers and enemy champions. If you get really close to enemies, you will slow them.

Support Items:

EVENSHROUD This Mythic Item is really great to have it when you play Galio as a Support. It gives you nice defensive stats and when you immobilize an enemy champion or you are being affected by enemy champion, they will take more damage by you and your allies.

LOCKET OF THE IRON SOLARI Another good Support Mythic Item for Galio. You can activate it to grant you and your allie a shield that can negate some damage. It's great to survive some deadly burst against some nasty champions.

VIGILANT WARDSTONE As a Support, if you are planning to carry more wards and you want to non stop putting wards anywhere, then this Item will surely help you.

KNIGHT'S VOW Great Support Item if you are planning to redirect their enemy damage and you and your ally will heal depending on your missing Health.

ZEKE'S CONVERGENCE This Support Item is good if you are planning to deal bonus damage while immobilizing an enemy champion and marking them. You can activate in on any ally to become an Accomplice. While your ally is marked by your Item, you and your ally will deal more damage to the marked enemy champion.

Elixir:

ELIXIR OF SORCERY If your build is full, then buy Elixir of Sorcery if you wanna to deal more damage. It is the best elixir for any mages including Galio. It gives your AP, Mana Regeneration and it has a passive that deals True Damage to the enemy champions and turrets.

ELIXIR OF IRON If you need more HP to tank their damage, then buy Elixir of Iron. It is best for any tanks or bruisers but also for Galio. It gives you Health, Tenacity and increased size and it has a passive that grants allied champions bonus movement speed when leaving path behind.

In the early game, your job is to focus on last hitting minions. If you are against a ranged champion, push your wave with Winds of War so you can force your enemy to farm under his tower. Try to not get poked too much early, you are not tanky before you get some few items and if you are having trouble early, call for your jungler to help. Galio has an excellent gank setup thanks to his Justice Punch and Shield of Durand and if you manage to get takedown, you will have a much easier lane. If you are however against a melee champion, you can trade them with Winds of War and Colossal Smash. Be careful around the minions, they will go aggro on you if you attack your opponent and don't let your opponent trade you for free. If you didn't managed to trade well, you will have a much hard time in your lane. On a first recall, if you have at least 1300 gold, then buy Lost Chapter if you are planning to buy Everfrost or Hextech Alternator if you are planning to buy other Mythic Items or if you wanna to reduce their damage, then go for Seeker's Armguard or Verdant Barrier depending on matchup. After that, your waveclear will be much faster and you will deal more damage to your opponent. If you have pushed your wave, you can go roam other lanes (especially if you have Predator) if their enemy is pushing hard. Galio is really good at roaming so you should be able to roam as much as you can. If your team is pushing and you can't roam, then just stay in your lane and farm and poke your enemy. After you have finished Mythic Item and you have some defensive items, you will start to shine and be tanky enough to reduce their damage.

In the mid game, you should still do the waveclear and roam other lanes often. Start taking objectives like taking the enemy towers, do dragons or try to steal their jungle camps (blue or red buff]. If you are somehow behind, don't worry. You will be still useful thanks to your tons of CC. Make sure that use your Hero's Entrance on someone who is going to engage first on the enemies like Leona, Thresh etc so that you have a high chance to knock your enemies up. Sometimes, you will manage to catch them but sometimes you don't but it's worth to try anyway. In the meantime, you should have completed at least 1 core item Zhonya's Hourglass and after that, you can go for Cosmic Drive or Demonic Embrace depending how the enemy team looks like. In teamfights, you should focus on squishy target like ADC or if the Mid or Top lane is fed but it's not tanky. If you have managed to kill who deals mostly a lot of damage, then you will have an easier time but make sure that your team doesn't screw up or you will probably lose the teamfight or even the game. Make sure to always take down objectives such as dragons and place wards in bushes or near at dragon and baron. Galio is great in teamfights with his CC abilities and tankiness so you should go first or second depending how good is your team at engaging.