Xit

Related to Blink, Xit (Exit) can save your entire party from otherwise certain death. Cast within a dungeon, the spell will transport the spellcaster and his companions back to the entrance to the dungeon. When your party is emperiled, Xit can make for a fast escape to the relative safety of the surface. This spell is essential to the adventurer who descends into dungeons where hazards cannot be predicted.

Note that it only works while in one of the corridors connecting the various dungeon rooms. Xit needs preparation, and therefore can't be cast in dungeon rooms or in battle.