I'm loving it that Hamun Khost is the Red Wizard du jour here, nice work DM.
Trepsin was/is terrifying, my guys- in my last play through of ToD- which is written up here, did all they could to avoid the confrontation- this after taking a brief kicking from the Troll & Drake patrol- they won through the patrol fight but it was tough, made easier by the Warlock's Hunger of Hadar (I hate that spell) from memory. They talked their way through this rest of this area... but at this point they were trying (and mostly succeeding) at chatting their way through lots of encounters.So, yeah... I'm thinking three trolls - one of which gets five attacks per turn - and three ambush drakes might have been overkill.
I'm pretty sure they don't come on this forum, so fire away. Your interest/input is much appreciated.