Just as an encouragement for players struggling with certain fights:
A party of 4, 2 1H shielded warriors with Witchcraft spells and 2 Jack of all Trades mages with again both Witchcraft spells entered the Tomb of Knights in hunters Edge at level 17.
All 4 guardians together got no more than 3 blows in, all 3 were blocked by shields (at 55 and 72% block chance). Not one single hit taken, although the complete first fight round was spent with positioning and attacks against willpower and resistances.
The effectivenes of lower/nullify resistances, divine light, blind, stun, soulsap and freeze was extremely effective, the party additionally got several knockdowns in after the application of divine light. I got no charm spells nowhere so far, otherwise I bet on even less action.
Fights really get easy as a cakewalk once you master crowd control.
Regards,
Thorsten