"For his "end-game" appearance, we're looking for clear signs of corruption and decay. I imagine him wearing the same hooded cloak, but no staff. His beard and hair completely fell off, the skin of his face is cracked and sunken, his eyes just two glowing violet lights with no discernable pupil or iris. Maybe bandages around his hands and forearms, with one arm in the same state as his face, and the other arm fully stripped to the bones and radiating violet energy. In a nutshell he should almost look like he's undead, animated only by a magic. Creepy, broken down but still eerie and powerful"