Our warrior tank can't stay alive on H Krosus either. Its not bad tanking. Its not bad healing. It's bad class mechanics and bad boss mechanics. Try doing H Tril with 10m group. Literally impossible because too many cakes spawn. NH doesnt scale well or even at all with smaller raid sizes. Never in my 12 years of raiding (semi-hardcore) have I ever seen a raid where certain classes are rendered entirely obsolete and have to be benched like the way NH is for warriors.