Shadow Mimicry

Shadow Form or Shadow Mimicry ("Nigrescence") is the ability to assume a form composed of shadow (solid darkness). One with this ability can blend into shadows completely (called Umbrageous Invisibility), or even teleport through them (called Umbrageous Teleportation). This can even be used to turn into a sentient shadow, moving along walls and impersonating the shadows of others, allowing one to sneak up on or away from foes.