I just killed it with about 8 strenght and 5 agility 4 int/endurance 3 charm, To anyone that wants to try this:
Save every turn, and try to get the most damage everytime (32~ max with this stats)
I got lucky and dodged three times his atacks, and got a 52 crit
Also, save everytime the monster hits you and load again. You don't load on the same damage received/dealt, so everytime you repeat the damage will be different.