Yeah what the hell is up with this guy. I mean I'm glad the game finally started to give me some sort of challenge. But this is HUGE spike in difficulty from what I'm seeing of this guy.
I'm talking about the boss that splits into 3, and uses the unrelenting force shout on you whenever you get near him, destroying your health and disarming you throwing your weapon somewhere random along with your own body flailing away like a crash test dummy.
first u gotta figure out which guy is the real sigdis. because if u hit the other two he'll just teleport. my suggestion would be to pick him off with arrows and the occasional shout. once u hit him once his health is down a little bit allowing u to ignore the fakes whose health are always full.
Breathing creates oxydation inside your body which kills you slowly... Thus, not breathing would grant you eternal youth and life.