Congratz!
To answer the post above about where to fight:
You need to be out of sight and out of range for melee attacks.
For Naggy I setup the group just behind the last bend leading into the room. I use harm shield on a necro and run in, send first pet, then run back down the stairs and join the group just out of sight.
If Naggy gets too close, I retreat down the hall, past the room with the fangs, and turn the corner leading down to the lava.
For Vox, I set up the group just past the door into vox's room. Again use harm shield on a necro and charge vox. Sick a pet on her, and run back to group. If Vox gets to close retreat out of the cave and work way back toward zin.