Shadow

Shadows are a form of incorporeal undead that resembles nothing more than their namesake. These wraith-like creatures exist to slay living beings, which they hate and desire to feed upon. When a shadow touches a living creature it saps the strength of the being. Any living creature slain by a shadow rises as a shadow soon afterwards.

Ecology
Shadows often travel in groups; hiding from the sun in the depths of the world or within buried ruins and crypts. Shadows can be found anywhere, and appear as patches of mobile gloom with a more or less humanoid shape. Shadows are always chaotic evil.