Shadow

The mysterious undead known as shadows lurk in dark places and feed on those who stray too far from the light.

Greater Shadow (Creature 7), Shadow (Creature 4)

Shadows might lurk in any dimly lit area—a corner in a crumbling ruin, a room lit by flickering candles, or a shaded forest at dusk. They travel to and from the Netherworld, though it is unclear if they do so via their own magic or by aligning themselves with a more powerful being capable of such planar shifting.