Umbra

A Tiefling with long horns stands in a dark street, the man chasing him blinks and as soon as he opens his eyes there's no one there. Another blink the Tiefling reappears behind the man. A third blink and the man is on the ground.

A purple haired Drow is surrounded by Kobolds in a grove, she closes her eyes and gestures with her hand, from her shadow emerges dark lances piercing every Kobold. She then disappears in the shadows of the trees.

A pasty Human stands beside an obelisk at night, his shadow stops laying on the ground and now stands with him, both of them synchronized start climbing the obelisks, at the top the Human and the shadow take a bow and start searching for their target.

There are some people that have an unnatural affinity with the Shadowfell, either due to magical mishaps on one's childhood, ritualistic events or mad experimentation. This connection gave them mastery over the shadows, these individuals are known as the Umbra.

Masters of the Shadows The Umbra are divided, their life is one step in the Prime Material Plane, and the other in the Shadowfell. The Shadowfell is the counterpart to the Feywild, while one is full of life, the other is the home of the dead, and while one magic of positive energies thrive, the other is based on necrotic energies, as such beings that are connected to the Shadowfell tend to have negative characteristics, this is the case of the Umbra, their body is always seeping necrotic energy, although for them to not be hindered by this they started to learn how to control it. As the name suggests the Shadowfell is the plane of shadows, when one uses their connection to this plane the necrotic energy takes the form of shadows, such shadows grant incredible advantages to those that know how to use them, but using them is exceptionally hard, it requires profound knowledge on how to control the energy passing through one's body, the Umbra are experts on this, they pass their life training and studying their bodies, achieving such mastery over the shadows that they know how to merge with them and even turn them solid. This affinity to the shadows made them famous for their assassination skills, a lot of Umbra turn to the underworld of crime and the demand for them is high, they can penetrate places and do things that the ordinary thief dreams of achieving. The Umbra are fighters of high maneuverability and the ones that know of their existence also know not to get involved with a hostile Umbra.

Living Portals The Umbra came to be through multiple ways, but their connection starts always during infancy as their connection to the Prime Plane is still new. Something may have happened in their formative years that made them become a portal of the necrotic energy of the Shadowfell. This characteristic of being the gateway between two planes put the Umbra at a high risk of being used by powerful inhabitants of the Shadowfell to be possessed or to be used as an easy way to the Material Plane, this fear is only ended at the Umbra's death.