Have you tried patching the game...
Minor spoilers!
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The Devourer is inside the Head Gaoler and if you kill him it will jump into and possess the other guards hanging around. You can either kill them as well or talk to them and convince them to snap out of their drugged state. If they do they'll flee the room and when there's no one left for the Devourer to possess it will attack you.
There's a door somewhere in the room you fough Callik in that leads to the other side of the fence and to Vengaul.
What two items did you give Formosa? She only needs the key to the storerooms and on top of that, that's just a side quest. Have you visited Meldanen yet?
The only thing you absolutely need to do in chapter 1 is to find the four creaures that escaped the Academy to proceed the game. Everything else are just side quests. There's one item in each of the four Districts; Peninsula District, Beggar's Nest, Blacklake District and the Docks. There's none of the items in the Core District, it's just a junction to the other four.
AFAIK it doesn't matter in which order you the find the reagent items as long as you find them all.
A word of warning though: Once you've found all the items and delivered them to Aribeth she will teleport you to a new location from where you can't return to Neverwinter. So make sure you solved all the quests you want to solve, have enough equipment to go around and to take whatever henchman you want with you before you agree to proceed.
As for the original problem with the tombs, I believe the the guy in the tomb in Peninsula Distr. is a dwarf named Briley. Just so you know you've found the right location when you find it.
[ 11-30-2003, 09:49 AM: Message edited by: Stratos ]