Arius Valdayn (Dark Age)

"... and I saw... I saw my brother, terribly maligned and wielding a lightsaber of crimson red hue. He was... leading legions to war. To death and destruction."

- Atheria Zoral to CC-6745 about a vision of Arius Valdayn as a lord of the Sith

Arius Valdayn was a Ethereal Human born on Luctanem in 42 BBY. However, due to a divergence of possible futures, the world he was born into was one in which the and  had gone quite differently, leaving the galaxy a dark, sinister and twisted version of itself. In this reality, Valdayn and his twin sister Atheria Valdayn were in fact only distantly-related cousins, both brought up as users of the of, with the latter incarnated as Atheria Zoral.

Valdayn and Zoral were both raised within the Ethereal Sector Provisional Administration, which was created by the alternate following the Ethereal Sector of their timeline's alignment with the Sith during the New Sith Wars. During the Clone Wars, Valdayn supported the, leading the Ethereal Imperium alongside Zoral after the death of his parents, Atlus Valdayn and Miraea Eredanus. During this time, the training of both was continued by, who trained them as Dark Acolytes in the vein of Asajj Ventress or Sora Bulq. However, the abilities of the two rapidly came to be more than a match for those of Tyranus near the end of the Clone Wars, and as a result, they were soon under the direct instruction of his master,, as Dark Side Adepts. Eventually, they became part of the following a period of additional training under. Valdayn was granted his own territory within the, as were many of Sidious' new Sith Lords.