Corpses (or, what's the use of dying)?

[Taqwus]

The game also distinguishes between armed corpses and unarmed corpses. The former can get you soulless armed with weapons, while the latter (produced through e.g. population dying from a deadly dominion, Black Death and the like) gets you your unarmed zombies.

Aside for use as Soulless, or for conversion to air gems, the Eater of the Dead finds corpses tasty.