Wtf, I don't get it. It took me 20 freaking levels to have a slim chance to beat this boss. I could kill the last boss (harpuia) in a single turn and still be unable to remove at least half of this one's hp without being extremely lucky. I guess with an alchemist I could have done more damage, but that doesn't change the fact that he could still kill most of my party in a single turn.
Well so I power-leveled until I got dampen with my hexer to negate his ridiculous resitance and here's the result... Omg why did they do this, the game's so easy now.
Oh btw I'm messing around a lot before getting to the boss but it's only to show what's the hell is going on. Basically this room is full of deadly foes that will chase you if they see you so you have to carefully navigate through them.