Psionicist Charm Bug : Vanguard Submissions

At level 18 Psionicist gets the skill Enthrall. In areas with mobs of the same type who aggro (their names are red), send in a charmed mob into a big group of similar mobs such that your charmed pet dies. At this time, all of the mobs will begin to attack each other. This helps clear the way in dungeons if all you care about is clearing quickly and getting to the dungeon boss.

After further testing this only works in most areas. You should be able to find its useful areas though to work this bug without much of a problem.