The targeted undead or demon enemy will be compelled to flee for up to 20 sec. Damage caused may interrupt the effect. Only one target can be turned at a time.
"The presence of the Light is enough to make any evil, whether they be one of the Scourge or even the Burning Legion, flee in terror."
Turn Evil affects both Undead and Demon targets. This ability was introduced in the 2.4 patch to replace Turn Undead.
While limited to only 2 of the different types of creatures in game, this ability is the only real form of crowd control given to paladins.