Uh, Darkhold to me was one of the easier dungeons to run with groups. The real difficulty challenge in this game comes from someone not knowing the mechanics on a fight. Once you know the mechanics, the dungeons are in fact pretty easy. The other major aspect of difficulty seems to be DPS gear as well. If they are under-par your group will fail certain dps this before time runs out mechanics. Which as a healer or a tank you have zero control over.