Runic Skin is inversely affected by effects that reduce Galio's magic resistance, such as the Abyssal Scepter or Fiddlesticks's Passive. The magic resistance reduction will reduce Galio's ability power for the duration of the effect. When Galio's magic resistance is brought below 0, he will lose ability power. Ability power has a lower cap of 0.
Due to his natural base 30 magic resistance he will begin the game with at least 15 ability power. With the addition of scaling per-level magic resistance, he will gain ~11 ability power at level 18 or roughly 0.6 ability power per level.
On the other hand, Runic Skin is triggered by his own ability, Bulwark, as well as any other effect that gives him temporary Magic Resist. Casting Bulwark right before another ability will, therefore, increase the impact of that second ability.
COST: 60 / 65 / 70 / 75 / 80 mana
Active: Galio fires a concussive blast from his eyes to a target 235-radius area, dealing magic damage and slowing enemies hit for 2.5 seconds.
Active: Galio shields an allied champion or himself for 4 seconds, increasing their armor and magic resistance. Each time that unit takes damage, Galio is healed. The heal is 20% weaker than the last for each consecutive hit.
Bulwark is an ally champion-targeted buff ability.
Bulwark has no cast time and does not interrupt Galio's previous orders.
Because Bulwark grants Magic Resistance, when cast on Galio himself it effectively grants him an additional 15 / 22.5 / 30 / 37.5 / 45 Ability Power due to the conversion ratio of Runic Skin.
COST: 70 / 75 / 80 / 85 / 90 mana
Active: Galio unleashes a gust of magical wind that deals magic damage to all enemies in its path. A directional draft remains for 5 seconds, increasing the movement speed of allies passing through it.
Allies who are facing the opposite direction of the draft will not receive the movement speed bonus.
Idol of Durand
COST: 100 mana
COOLDOWN: 150 / 135 / 120
Active: Galio becomes a statue and channels for 2 seconds, taunting nearby foes and reducing incoming physical and magic damage by 50%.
When the channel ends, Galio bursts out of his statue form, dealing magic damage to enemies within range. The damage is increased by 5% for each attack suffered while channeling, capping at 40%. If the channel is canceled, the damage radius is reduced to 575 instead of normal.
While channeling, Galio can cast Bulwark and use instant cast actives, such as Ignite.