Niigata Clan

Background
Initially made up of rouge shinobi of the Nara clan. A small cluster of shinobi defiant of the First Hokage's reign left the village roaming the forests for years. It was then thatthey found Kagegakure where they unlocked the full power of their shadow manipulation. Their chakra became tainted and gained the Ability known as Shade Release. They gained the ability to manipulate and shape the shadows into various more forms.

Kekkei Genkai
The shadows of Kagegakure reacting with their natural shadow affinities lead to the creation of Shade Release. This is the manifestation of the user's now tainted chakra being merged with the shadows around them allowing them to take on a much more dangerous form.