Whether Fragarach hits anything automatically depends of the alignment of the user, if your Char. is C.Good it will auto hit any opponent, even Iuz and St.Cuthbert.
Iuz isn't hard if you are prepeared for the encounter, all the other monsters are my main problem. If you remove the Etiins, Giants & Mages first Iuz should go down if you put all your strenght at him. Also remember that he has 'reach'.
Now, St.Cuthbert is MUCH harder, and to even get into fighting modus with him is tricky, but you DON'T NEED TO HACK your PC's !! St.Cuth. doesn't have reach, and if you have a C.G. Fighter (or any other able to wield B.Swords) equipped with Fragarach and a potion of Invisibility and another with Scather and a potion you should do fine if you use the right spells.
I took him single handedly with my C.G. Cleric with B.Sword Feat by using the lvl 3 spell 'Meld Into Stone'. St.Cuthbert killed himself on the retaliating attacks from Fragarach.
Btw he had close to 1600 HP's and NO equipment of value. His Mace looks cool but is a quite ordinary nonmagical mace.
And as far as i know you don't get XP for killing either of the gods, please check your logbooks. I haven't installed the latest Atari patch yet, but before that you didn't get xp for monsters with a CR above 40/50 or so, and both Gods are above that.
Have Fun & kill Evil
