[Phantasm]

My own lich is not necessarily skeletal, but a spirit bound to its phylactery and able to possess a corpse for as long as the corpse lasts, with magic to keep the corpse from decaying further. Should the body be destroyed, the lich retreats into the phylactery until it is brought close to a suitable dead body for it to possess. Some liches (lichen? nah) are pickier than others, and some have been known to jump to a better looking corpse at will and whim.

I still need to stat up this lich template, though. The body form will likely be one of the corporeal undead meta-traits from Fantasy, tho.