Not really sure how I can help out with this other than post a few rounds of combat against NPCs so here is a screenshot of a typical 2v1 fight of me and my druid box against a dark blue con mob.
NPC: Highkeep guard
CON: Dark blue
AC: 502
ATTK: 572
Classes: 30 warrior, 29 druid
Buffs: SoW, Skin like Steel, Strength of Earth, Shield of Brambles
Weapon: 2h slash
Weapon Skill: 125-130
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Used 50% of my mana on greater heal, both the warrior and druid still died. I never remembered highkeep guards hitting for 71 which I assume is their max.