Xerath Ability (LoL): Eye of Destruction

Xerath calls down a blast of arcane energy, which strikes after a 0.5 second delay dealing 60 / 95 / 130 / 165 / 200 (+60% of ability power) magic damage and slowing enemies in a target 200-radius area by 25% for 2.5 seconds.

Enemies hit directly take 100 / 158.4 / 216.7 / 275 / 333.3 (+100.2% of ability power) magic damage and are slowed by 60 / 65 / 70 / 75 / 80 % instead. The empowered slow decays down to 25% over the duration.