If you were doing sunken temple of qarn as a Marauder, the problem was likely that you weren't a Warrior yet as people have been saying. I had a FC member that I was helping XP and they read a months-old guide that was intended for FATE grinding and he kept telling me that Warrior was useless until X level, but lo and behold in Qarn he can't take much damage, hold hate, and he drops really quickly. I told him to exit and try it again as Warrior and it was like night and day.

Not only will just changing to Warrior give you more HP, the Defiance ability it starts with gives you 25% more on top of that and boosts your enmity gain.