Orianna Ability (LoL): Clockwork Windup

Orianna's autoattacks deal additional 10 / 18 / 26 / 34 / 42 / 50 (+15% of ability power) magic damage every hit. This amount increases every 3 levels. Subsequent attacks on the same target within 4 seconds will add 20% more damage per hit. This bonus stacks up to two times.