This dark lord of the sith was around during the time Palpatine first came into power over his republic/empire. He nearly ruined Darth Sidious's plans to take full control, as well as this seduction of Anikin to the dark side.
Later Tal-Oc would fall to Vader's secret apprentice, after Vader himself could not take down Tal=Oc.
Palpatine never got the answers to why his dark lord stayed off his radar or who he truly was...but their rivalry lasted decades, including a few confrontation that left both Sidious and his aprinatce Vader, scared and weak.
Woah M G!!!!! Amazing! This is one of the best sith lords I have ever seen! I lopve the story that accompanies it, too. 5/5 from me. Deserves higher marks, but MOCpages made it so it goes up to 5... I wish it went up to 98765678765 out of 5, so I could give you that...