Umbrakinesis is the supernatural ability to manipulate and possibly even generate shadows. Umbra is latin for Shadow, thus the name is self-explanatory on its capability.
Users of this ability
The Oni possess the ability to teleport through darkness from one place to another within seconds. Their bodies are seemingly made out of shadows and darkness, as well as their swords. They are capable of leaving poisonous wounds that give off a shadowy effect.
Sebastien's transformation power is triggered by summoning shadows and smoke from the Earth to form a corporeal shell around his humanoid body. In his beast form, he has a continuous aura of shadows.