Xerath Ability (LoL): Rite of the Arcane

Xerath ascends to his true form and channels for 10 seconds. During this time he may Recast up to 4 / 5 / 6 times.

Recast: Xerath launches a magical artillery, dealing 180 / 230 / 280 (+40% of ability power) magic damage. For each champion hit, the artillery deals an additional 20 / 25 / 30 (+5% of ability power) magic damage.