Following his return to Gallifray at the end, no one knows what has happened to the Master since then. Due to the 9th, 11th, and 12th faces of the Doctor uniting to change history and put Gallifray in an isolated location for safekeeping, the Master has since disappeared from the face of the multiverse.
Rumour has it that he now occasionally gets into dick measuring contests with Professor Zoom and Q on who the douchiest Chronogod is. That’s the only word we have on him.
He is not to be confused with Missy, who is actually the new face of the Rani.
Powers and abilities
Stubbornness: He was able to last long enough with that decaying Ugly Face.
Regeneration: Like any Chronogod, the Master often steals people's faces whenever he's about to die, but he has often stolen too many (often going over the limit).
Laser: The Master fires his Laser to age other people rapidly.