User blog comment:Commander Marko/Roddus, the Colossus Titan/@comment-7709681-20140307003048/@comment-7709681-20140307143410

@Nelraye: What it does is that gains stacks for each enemy unit that dies close to him inmediatly after their death, this stacks represent a scaling value that turns into physical damage on-hit. However, the damage on-hit only triggers if the target is under the health treshold that the ability specifies.

Still monstruous and effortless if you ask, even now that he, Marko, patched him.