Quartz
Hero
Having read the adventure, I think having an undead character is sheer folly. All the characters should go in with Contingent Resurrection on them, which won't work for an undead.
. And the undead PC won't be able to benefit from Cure spells, Lay on Hands, etc. And there's the little problem of Mummy Rot. And so on.
And there's a very high level EHP who might well Command your undead PC