my advice, go for one handed weapons but not the flametounge (coz i think mateus is immune to fire though he's ice element) so that you can use the ice shields, anti sleep acc., best armor, and just unload quickening chain right then and there when all his ice azers are near by....
when you finish one chain, move away one of your characters to use the charge technik for him to spam healing and let the other two rip mateus apart.....
but it's really up to you...
this is what i did last time i fought Mateus, the Corrupt.....