[Omeganaut]

The Prest I fear are perhaps too strong. Even for pathfinder. These guys are tailored to be great warriors. Wis is the one stat very useful for fighters, and you gave them another bonus to their will saves, which is generally the weak point for fighters. And then they get some awesome weapon proficiencies, armor proficiency, intimidate bonus, and low-light vision. I'd take some of that away, preferably the will save boost, and replace it with something to help non-melee classes.

I'd also specify the races of all the major characters you haven't previously. Its always good to know where the baddies came from so you can understand their motivations better.