Lambach
Arcane

From what I've seen of her, that seems extremely doubtful. Plus, HP seems so bloated on some monsters that 70 DMG per round is almost nothing.
No, sounds about right. Properly buffed, with Armag's sword and a bunch of levels in Two-Handed Fighter (for AB and damage bonuses) she really does blow things up. Still, pound-for-pound, Nok-nok will outdamage her by a decent margin if you keep leveling him as a Knife Master and he has STR drain + Trickery.
Regarding Sneak Attacks, in the Forgotten Realms setting, there are a butt load of creatures immune to them: Constructs, Undead, Elementals etc. Here, it seems everything is susceptible to Sneak Attacks. Does it really work that way in Pathfinder or is it a feature/bug introduced in the game?