Sion Ability (LoL): Soul Furnace

Passive: Sion permanently gains 4 bonus health whenever he kills a unit, increased to 15 against large units and champion kills and assists.

Active: Sion surrounds himself with a shield that absorbs 60 / 75 / 90 / 105 / 120 (+40% of ability power) (+8 / 10 / 12 / 14 / 16% of Sion's maximum health) damage for up to 6 seconds. After 3 seconds, Soul Furnace can be recast to detonate the shield if it hasn't been destroyed, dealing 40 / 65 / 90 / 115 / 140 (+40% of ability power) (+10 / 11 / 12 / 13 / 14% of target's maximum health) magic damage to all nearby enemies. Bonus damage from the target's maximum health is capped at 400 against minions and monsters. The shield will detonate automatically if it persists for the full 6 seconds.

Soul Furnace can be activated and detonated while using any of his abilities.