Thyet guards the main gates of Meridell castle. When Ramtor took he throne, he bewitched Thyet and the other guards. After Ramtor's defeat, Thyet served as a form of inn, offering a night's rest in the castle's empty bedrooms to travellers.
Oh, I can't believe it! You've defeated Ramtor! Or at least, gotten him away from the castle.
As most of Neoquest II takes place within a computer simulation, it is unclear if Thyet exists in the real Neopia.