am guessing its cos of the dota updates or something, but lich king had a damage return it came and gone like it was blademail, also depending on what hieght you are aka the raised platform his nuke abiltiy wont touch ya and you can be right next to him.

also i think centaur warrunner needs debuffing as he seems to be invincible or ive just played this too many times, i completed it with one other person he was wk i was centaur warrunner