On Interesting Treasure: The Plated Skull
The fine work and craftsmanship give this high value, and initial delvers will assume that this is some sort of art or artifact created by whatever long dead society once lived among these halls.
However the Vordoz, specifically Larnik the Insufferable, begs to differ with their assumption. His crystaline body, deprived of a head, but not of life, still endlessly searches for where his head is hidden.
If it is somehow removed from the protective wards in the chamber that it lies in, he will surely have a much easier time locating it.
Gold piece value: 4000 gold pieces to an interested party, 800 gold pieces as a curiosity.