lol deaden I think u just need to rethink ur moves . it took me a couple of trys but i got it. only had to take 2 heal potions during the whole end game scene . I did take the time to mind read all I could to get skill / character pionts at the end I had all my stats dxt/str/int with potions up to 74 ish or a tad higher. My resist where all atleast 40 or higher .
If you rushed through the game I could def see where you are running into problems i did have to revert some saves .
Also after the autosave I would definitly say just to the side I tried head on attack but to much at once