I make one reply and everybody starts talking!
What's the big myth around sorcerers and where they get their powers?
He changed into a brass dragon. I was working off info from the Monster Manual - spikes under the chin for a 'beard' and the burnished coloring.
It's not about him going evil, but about his latent dragon blood coming to the fore. Now he's got all these neato, extra powers to play with. No more relying on his 'girls' to keep him safe in a fight.