Forum:Toughest boss?

Due to an older thread of mine discussing a certain destroyer being too easy, I'm wondering: Which boss (or the like) do people generally regard as the toughest/hardest to beat? This is, ofcourse, individual both to character and player, but I'm still curious what people think!

Personally I think that the Mothrakk was purely annoying as #¤%&! Not even running could allow me to evade those fireballs, so I had to hide under the stone "bridge" nearby and shoot him with my combat rifle (And playing Lilith and favouring the SMG, I didn't have very much profiency with it) and after fifteen painstaking minutes he finally fell dead! //Dramatic Entrance 22:49, October 31, 2009 (UTC)