Hey guys, so right now I'm doing the quest "A Scroll for Anska" and about to get into the boss fight (Vokun), but I'm only in lvl 18 and I've died three times already from this guy's staff of fireballs. So I ran back out to Skyrim and decided to level up my weapons more before going back and fighting Vokun.. But problem is.. I'm not sure if this will disrupt the quest line, because Anska also followed me out. (I still have the save right before going into the fight Vokun though so I can still reload.)

So do you guys know what happens if I do this (left in the middle of the quest)? Can I still go back to this quest like normal after levelling up some more and proceed with this quest?
Otherwise, any tips of killing Vokun? I'm using two-handed sword with enchantments with fullset heavy armor. (still dies)

Thanks in advance!

As I understand it, you can do whatever you please and Anska will just keep following you. Vokun however can't level up and stays fixed in relation to your level as you entered the place the first time.

For a tip I would recommend potions; resist magic, resist fire, fortify heavy armor, etc. (and naturally lots and lots of healing and stamina)