Anyway, managed to beat him. The key was to throw heavy explosive bombs with Althea (&Jariel), and trying to inflict as many DoTs as possible on him, since both Shattered and Burned will give him -33hp per turn, which turned to be crucial in my trial. Also, Rowinda's candy was heavily used towards the end to deal with the constant paralysis. I didn't use Krimm. Placed Rowinda, Shea, Jariel in the front. Althea, Riley, Vaelis in the back. This party was hugely problematic for this type of a fight. I think that in RPGs, one usually need to take into consideration both the capability to do high singular enemy dmg as well as some row damage. ...
Editing more in here shortly, plus uploading savefile taken immediately after the battle, if you wanna use that to continue.
