[@Pyromaniacwolf]I'm not sure what I'll do with Palpatine yet.

I may have Plagius be from the Empire and he taught Palp about the dark side after Palp had learned from a mentor from the CIS.  Palp will then find tattered remnants of ancient Sith writings in Plagius's collection and decipher them, as he had some proper training in Force theory.  This power let him give his Master a kind of pandora's box of knowledge. Plagius could manipulate life itself, but it slowly cut him off from the Force.  Eventually Palp was stronger than him and knew how to properly manipulate life with the Dark Side, so he finished draining the life from Plagius as he slept and made himself younger in the process.  This lets him look to be in his forties when he's really in his sixties.