I've fought several liches so far throughout my game, but two of them came out of sarcopheguses (bad spelling) that also held golden bones. i fought both of these liches within athkatla, and from their tombs i have gotten a golden ribcage/torso, and from another a pair of golden arms and legs. I'm guessing all i need now is a skull to finish it off.... does anyone know where it is? and what you get when you complete the skeleton??

The skull is still animate, and is in a house to the west of Mae'Var's guildhall. A warning if you choose to give the bones to the skull; you will have one incredibly tough battle on your hands. You do get a Ring of Gaxx if you pull through, though.