Board Thread:League of Legends discussion/@comment-31522872-20170315040709/@comment-3243496-20170327004118

Yes.

Hitting an enemy champion with an ability ( ability damage ) or basic attack ( on-hit ) marks them with  Thunderlord's Decree  for 3 seconds. At 3 stacks, the target is dealt  10 - 180 (based on level)  +  (30% bonus AD)  +  (10% AP)   magic damage  in an area around them. Thunderlord's Decree  can only be triggered once every  25 - 15 (based on level) seconds.