>>3959290I kind of assumed he transformed himself into a mystic to keep them from realising he's a human. We know Magus can do transformation magic (turns Glenn into a frog) and mystics aren't friendly towards humans, so Janus transforming himself would be basic self-preservation.
But there's no real explanation. There are monsters that look like mystics on the Mountain of Woe in the ice age, but the game implies that the Zealians just merge with the regular human population instead of the monsters.
