[Soapyfrog]

From what I have seen, this saurolich also has a champion's trident, and a defence stat of 23, but is not otherwise equipped.

I think the defence stat is the biggest problem... 20 protection is really not all THAT much.

I would suggest concentration on fire-based spells that ignore MR. A mass of crossbows might do the trick too, esp. with flaming arrows cast.

To bring him to final death, I agree with gandalf, you have to push your dominion and that means temples and priests... hwoever avoid building temples in non-castled provicnes since they are pretty trivial to destroy.