This whole thing seems rushed. I love the flavor and the set up, but there's several things left out, brushed aside, or that just plain don't make sense.
I'm going to spoiler my main problems here:
How the heck is a Behir supposed to have gotten anywhere if it's huge, all the doors between these places are typical 5-foot affairs, and it doesn't have any Escape Artist?
D8 East Hall:
The Darkskull doesn't specify what spell effect is tied into its Unhallow.
My guess is it's supposed to be Cause Fear based on the flavor at the end of D4 Audience Chamber.
D10 Operating Laboratory:
Why doesn't Togarin simply go find and kill time-shifted Rozimus himself? He and his tiger are more than a match for 3 Caryatid Columns at a time, and I assume that the trap in D7 North Hall is of his design (since it's within his personal section), so he should be able to bypass it. Also, shouldn't his Dire Tiger be undead or something? It's mentioned that it's skinless, and he is a necromancer. Its skin animates as an undead in the next room, as well.
D13 Daegros's Foyer:
The first line here should apply to D5 Teleportation Plumes.
There's a few other minor issues that I have with flavor/mechanics consistency but those can be handwaved in some fashion.
Advice? Thoughts?