Tenebrae

God son
Tenebrae was the son of Snoke, he created him thanks to the Force on Exegol he was the perfect creation of Snoke for his plans, Vitiate was very powerful in the Force. when Tenebrae grow up, the Sith Loyalists created a citadel on Dromund Kaas who was a gift from Snoke himself.

Snoke gave the order to Vitiate to create his own Sith Empire for show a beginning of the army and continue to make busy the Republic for make his preparation.

With the time Tenebrae will have a wife called Senya and three adopted children called Galen, Alek, and Dilya who Vitiate didn't gave any attention to her.