Clerics and Paladins have the ability to turn undead creatures. When this mode is activated and the undead creatures are in range of the character, there is a possibility the undead will stop attacking their targets and run away from the character until the effect is worn off. At higher levels, this mode may destroy undead. In reverse of this, Evil Clerics can bring undead creatures under their control.
While the mode is active, the character using it can't perform any actions aside from moving.