No spoiler in the title. Those of you who know this guy's situation, is he supposed to be in a state of weakened or stunted magicka? After 20 bolts or so of him trying to range me with chain lightning he stopped firing completely. I assumed he had run out of magicka and was glad, because he kills in one hit and I had only two weak resist magicka potions.

After he stopped firing he simply maintained a short distance from me. My fire atronach woman killed him with her proximity flames while I hid behind a pillar. We were in the hall away from the main chamber, so maybe has to be in the main chamber to regenerate his magicka?

I swear that is when he stopped firing - after leaving the main chamber into the earlier area just outside, but I have no saves within that time because of quicksaving all the way back to the College. Had he not stopped ranging it would have been insanely tedius and dangerous to kill him with magicka only for as long has he can last on expert difficulty.

I think the dragonpriests may have an AI problem, i encountered something similiar with krosis, except he just seemed to lose interest after a good 15 seconds, then he just stood there and let me beat on him.

I redid CoW after 1.4 and defeated Morokei w/o effort as I drained what littoe magicka he seemed to have and then he just stood there

Usually the Dragon Priests attack me about ten times, and then run levitate away. That makes them even harder to beat, I had to chase Krosis all the way down a mountain.

Well, then. That settles that. Dragon Priests are bugged, Expert difficulty is terrible for magicka users ( I can't beat a normal dragon or wispmother without exploiting ), and Morokei would have killed me easily if he had not glitched. That means that I can't continue to wear the mask, and I must get a magicka mod or lower to Adept. Thank you all.

Undeads are quite stupid... I can live with a corpse loosing interest in me 10 seconds after I hide behind a pillar... the problem is that NPCs are not far smarter,

One thing to consider for a mage build is Breton with Atronach stone. This gives you complete immunity to magic (and free magicka) for 60sec against Dragon Priests. This makes them a trivial opponent at any difficulty, assuming you can get by the usual Deathlords around them.

One other thing I've noticed is that if you get the DP in a corner, they can't seem to complete their casting animation.