The "Fallen One" is one of the names of the last boss. If you follow the main story, you'll eventually end up fighting him. Are you stuck somewhere?
Hello, sir. Mostly just trying to finish the quests of the guys.
Silth is the last master with an impending unsolved business.
So once I beat Falgar, Silth's power's recovered?
You can recover Slith's powers after fighting Falgar. There's another area afterwards.
Thank you!