Darth Arrid

Darth Arrid was a male Sith Lord of the Sith Empire. When his mother Darth Vax died, he assumed her seat on the Dark Council. However, Vax was unable to let go of her power and influence and began influencing her son for her own agenda as a Force ghost. Her actions remained a secret from the rest of Dark Council for four years before they realized what was happening.

Behind the scenes
Darth Arrid is mentioned in Star Wars: The Old Republic: Knights of the Fallen Empire in a codex entry obtained during Chapter 12: Visions in the Dark.