Recently,Tons of youtube videos showing dark seer vacuuming heroes on top of cliffs like this. http://www.youtube.com/watch?v=khvw0pcBB0I
Vengeful spirit version. http://www.youtube.com/watch?v=hiicLbeVJyM .Seriously, its game-breaking and funny(admit it).Set the skills to move people to the edge of the cliffs so that people wont abuse it.