Hope no one was put out by Velani 'deciding' Frazzle had to die. I really thought long and hard about what she would say and do at that moment. Took me a couple tries to come up with the right words and attitude. I felt like Tevia in Fiddler on the Roof - one one hand... but on the other hand... THERE IS NO OTHER HAND!
I think it was well played- I'll be honest I expected you to let the Gnome off the hook, the fact that you did the opposite impressed me- meta versus characterisation.
From my POV, and with a DMs hindsight, I think it marvelously fitting that Frazzle died caught in a zone of Necrotic power, or else he could have shuffled backwards and be struck down by Velani's Radiant power. He chose a necrotic death for a reason... see below.
Of course that leaves a gap in your story, or else your understanding of the events here in the crypt- particularly with the new info I've just posted as regards Vecna.
A better Arcana skill check would certainly help you along at this point, Viator? Ah-shahran? Perhaps you could oblige.
Just to say I would like you to consider the report you are going to write/produce on your return to civilisation- Eoffram Troyas will be expecting an answer to the following questions (and perhaps others)-
What is/was going on at the Rivenroar Crypt?
What forces are/were at work there?
How do your findings tie in with the revival of the Red Hand?
At the end of each of the scenarios I think it would be a good thing to produce some sort of report/story-so-far document- concise of course, but something that will provide you (and me) with a summary of situation so far. I believe this will be of use to you (and me) as we progress through these adventures.
Obviously I'll help you out as much as I can with this, I don't intend it to be homework so much as (as I've already stated) a help sheet/status report so that you can try and divine how the events that follow fit the pattern.
Wonderful play people.