Naga Sadow vs vs Lord Vitiate (Tenebrae/Sith Emperor)
Instead of the canonical story of waiting it out, one of Ragnos' successors (Vitiate) challenges Naga Sadow on who should be the rightful lord of the sith empire in single combat, Naga Sadow accepts and jumps down much like Malgus did in his fight during Swtor off his throne when the strike time came, as there were not lightsabers back then, they both simply empower their blade's like ancient sith would, and the battle begins. This is post-Nathema destruction Immortal Vitiate by the way. Who wins? (Edit: Don't know what
specific year that Tenebrae destroyed Nathema but it's still going to be post-Nathema Tenebrae)