Idea:
Control of Darkness:
Users can create, shape and manipulate darkness and shadows. By itself, darkness is mostly used to cloud everything into total darkness, but by accessing a dimension of dark energy it can be channeled to a variety of effects, both as an absence of light and a solid substance: one can also control and manipulate the beings that exist there, create and dispel shields and areas of total darkness, create constructs and weapons, teleport one's self through massive distances via shadows, etc.
Create/generate/increase, absorb, shape and manipulate darkness/shadow for various effects, sizes, shapes and intensity levels.
Depending of the level of strength, one can blanket an entire city, country or world in eternal darkness.
Absolute Darkness
Darkness "Mist"
Light Absorption
Shadow Camouflage/Cloaking
Darkness Adaptation
Night Vision
Darkness Attacks
Darkness Solidification via controlling darkness/shadow:
Animating/manipulate darkness/shadow, whether users own or cast by anything else.
Tentacles/tendrils, chains and/or threads to attack or bind.
Umbrakinetic Constructs, including weapons, walls, armor or allies/servants.
Flight/Levitation
Shadow Marionette