Looks like you're the victim of a "Random Spawn", Big Dave!
Kill one mantrap, then wait it out until your wizard gets his mana back up, then kill the other one. The mantraps can't get their big green butts down the tunnel, so you'll be okay, just stay out of range.
Do you have any mana potions or mana more, mana max potions? Now's the time to use them!
Might that "something" you're looking for be a writ, perhaps? Here's a map where you can find one:
