Flash - one of, is indeed the most adaptive Summoner Spell to counterfeit in the rift.

Exhaust - one of the most beneficial yet underrated Summoner spell you should consider, because it Slows Opposing Movement speed and Reduces Inflicted Champion's Supposed Unfriendly Burst

For the Resolve Path - please take my considerations:

* [Aftershock] - buffs him a potential Burst to properly engage a fight as a Bulwark he is indeed.

* I chose [Demolish] because this guarantee a Galio Player an opportunity to score objective performance pressure to win.

* I take [Conditioning] because though underrated it indeed amplifies Galio's Base Bulwark scaling also ensuring his Tankiness either building Semi-Tank or Focused Burst.

* I Take [Revitalize] to ensure his Shield's strength and scoring Triumph to be much worth.

For the Precision Path - Galio himself is precise rather than a Sorcery of his tale.

* [Triumph] is what Galio delights himself to stay longer in a fight.

* [Coup de grace] Because Galio a Colossus himself is a Burst Tank and he had enough sustain, so to further prove his Might, you better understand how his COLOSSAL SMASH INDEED DEALS DAMAGE.

For the Lesser Runes:

* Judging my Build preferences, to score a 40% CDR this would do fine and enough.

* An Adaptive Damage you may always take consideration.

* and the Solid 15-90 HP per level to somewhat sustain his Base Health Scaling.

Every Items I had presented were efficient from my own resourcefulness, and also to implement the same resourcefulness to you fellow Summoner,rather than going straightforward Infinity Edge as a Marksman to compensate with the Damage you should achieve so you can focus utility after.

Mercury Treads - Scales your Magic and gives you Tenacity.

Hextech Protobelt - Compensate with your Pressure as a Mid Laner to engage.

Liandry's Torment - helps you to deals much efficient Tons of Damage rather than taking Morellonomicon.

Righteous Glory - This is pure worth, judging by the fact that Galio can't cast Shield of Durand before Flash anymore, this is very great to scale further enough. Also is indeed efficient to follow up a Shield of Durand Charge after landing your Hero's Entrance.

Gargoyle Stoneplate - this is his iconic Item and is a should consider for its bulwark buffs.

Abbysal Mask - when against AP BURSTS(such as Lux, Syndra or Annie) or AP Assassins (likes of Dianna, Fizz or Akali) because it ensures your stature enough than taking Protobelt First.

Void Staff - to be having the Magic Penetration, this costs less than Liandry's Torment and much easy to build than Morellonomicon, Percentage Defense Penetration applies before the Flat Penetration that's why I consider this over Morello's.

Banshee's Veil - consider building this if Enemy has "Tons of CC" somehow to preserve Stature.

Adaptive Helm - This is good against likes of Teemo, Morgana and Mordekaiser but seems Risky.

Ninja Tabi - the Percentage Block is efficient against On-hit Champions.

Iceborn Gauntlet - consider taking when having a hard time against likes of Yasuo, Zed or Talon, and it would compensate with your stature against them.

Bramble Vest - you do not need to be rushing Thornmail because the "Reflect On-hit Buff" is much necessary to compensate against on-hits.

Frozen Heart - Rather than Taking Randuin's Omen, this would help Galio much more.

* Colossal Smash - Next Basic attack deals base scaling damage against an enemy and those nearby surrounding.

* Winds of War - Galio fires a twin of flat force that damages and arc to either side and reuniting unto a point to create a focused tornado that deals solid damage per second, also base on the enemy hit's missing health.

* Shield of Durand - Passively generates a base scaling Shield that absorbs Damage (Prefers Sorcery Damage) and recharges through out after absorbing damage and exiting combat.

- Activating it stances Galio into a defensive form charging focused unfriendly barrier that grows that slows him marching through out until he discharges it, or reactivating it against Enemy Champions to be caught en thus taunting them to his direction.

* Justice Punch - Galio discharges leaping backwards en thus preparing to counter attack, dashing through with a jab knocking back enemies and if he hit an Enemy Champion, he instead knock him/her airborne with a colossal uppercut err-- body blow.

* Hero's Entrance - Galio Discharges to summon himself on to an Ally's location binding himself to him as he fly through and descending as the Colossal he truly is, dealing solid earthly damage and knocking up airborne nearby Enemies if caught.