A belief held by all on Tymeara is that a Being, a person, is formed of six different parts: Body, Soul, Mind, Spirit, Essence (or life-force) and the Word of Being. The weakest of all undead only possess two of these parts: the Word of Being and one other. The more remaining after death, the more powerful the Undead will be - all the way up to liches, the mightiest and most feared of their kind.
There are certain places that are of special significance to the undead and it would be most wise for mortals to keep well clear. Unfortunately curiousity is a common curse of mortality...
Uth Necros - there are several necropoli across Tymaera but this is the most infamous.
The Citadel of Dusk - Home of the Liche-king Bel'Sharoth
The Valley of the Dead - located in the great Dragon Mountains north of Nerat. This is where Uth Necros is located.