Three Mantraps once had me cornered at the gates of Ishad N'ha. After receiving some comments from Wyvern, I beat them as follows:
I climbed to the top of the town gates during a time with bright daylight. Make sure your view distance is set a maximum so you can see them long before you are in THEIR range. You can hit anything with spells that you can see, even from a very far distance. Use Flamedrop or Burning Haze to keep the Mantraps from advancing too close, then hit them with your best spells. At your level, that may only be Flamestrike and Elemental Blast. I hope you have more than one wizard. I had less trouble because I had Meteorstorm and enough points to cast it twice. You can still beat them with the lower spells if they are close enough together to hit at the same time. You won't have enough time to drink Mana Potions, so make sure you have Merlin's Shield cast early and then drink the Mana potions before the Mantraps arrive.
Good Luck!
P.S. - Did you make it through the gate in the fire pits at the Crypt?
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