Quote Originally Posted by Tavrobel View Post
I suppose, yes, because Belias is required for one part of the game. But I still have yet to activate Mateus and up.

Quickenings > Espers, especially when you reach the higher numbers, like 25+.
You do need to defeat Mateus to finish the Stillshrine of Mirian, iirc.

It is worth getting him / her just to see the special attack: it is very cool. Besides, Mateus casts Cura on itself so it usually lasts longer than Belias