“Raven”

That is characterized as a feral-like Mastery that is quite literally the embodiement of a void.

Type: VIG, PAC

Danger level: High

Along side the ability to turn into a Sensor-like form, Tenebrosity gives its wielder the ability to travel stealthly or teleport between shadows.
Sensor-like abilities include but aren't limited to: regeneration, immortality, vesatility, metamorphosis, multipliction, limited shapeshifting, and peace with other Sensors.

Although certain abilities such as regeneration and immortality are only limited to areas infected by Tenebrosity like the limbs, in the case the wielder manages to trigger the Mastery's final form, their entire body instantly heals of any damages no matter their extent.

It has been rumored terrible consequences a human get injured by Tenebrosity's final form.