User blog comment:Niyanrudan/Arc, the Assassin of Time/@comment-72.13.221.48-20120529050419/@comment-5054161-20120530105908

Are you referring to his ulti? If yes, no, it's not like Katarina's. Her Death Lotus is a channeling DPS type, or so I think.

Arc, on the other hand, is an instant, burst damage type once he appears on the target area.