Dark Mane

The Dark Mane is a dro-m'Athra who has possessed mane Akkhuz-ri and unleashed the dro-m'Athra upon Reaper's March. According to legend, the Dark Mane was the leader of the Khajiiti people in ancient times. He fell from grace, and was cast out of the Moon's light, forced to walk in darkness for all eternity.

Source: uesp.net.

This model has a black and blue semi-transparent dro-m'Athra visual effect applied to it in-game.