Stormsurge

Unique – Stormraider: Dealing damage to an enemy champion equal to 25% of their maximum health within 2.5 seconds inflicts them with Squall (30 second cooldown, starts on Squall's application).

Unique – Squall: After 2 seconds of having applied Squall, strike the target with lightning, dealing 125 (+ 10% AP) magic damage to them. If the target dies before being struck, they emit an electric field instantly that shocks all enemy champions in a 600 radius, dealing them the same damage.

Limited to 1 Stormsurge.