First off, this series has been a wonderful tool for GM's, and Temerlyth is a strong, well designed character. From his clothes to his specific battle tactics, he can be a well-designed, in a pinch boss fight.
Not to be a 2D "Bad Guy" he has motivations and reasons, and doesn't just openly attack, but rather searches for information...which, unlike most bosses, gives a reason for a possible ally.
All in all, this a solid, CR16 built boss with a beautifully, well-written backstory, completed character block, and the feeling of a fully-fleshed (pun intended) character.
[5 of 5 Stars!]