The Dread Knight is a terrifying opponent who surrounds himself in battle with a tangible pall of fear and dispair. These grim warriors use dark magic to empower and augment their already potent martial abilities. The aura of fear the Dread Knight radiates in combat demoralizes and weakens any opponent that dares draw near. The Dread Knight wears Heavy Armor and wields many types of Melee Weapons.
Dread Knights have an ability called Dreadful Countenance. This is always active. When he is in combat with a mob, the mob will be afraid and will suffer reductions in its combat ability (debuff). The longer the mob is in combat with the Dread Knight, the worse the fear becomes, and the more effect the fear has on its ability to fight. There are currently 5 levels of this fear. And at the highest levels, the fear extends to additional mobs.
This ability is NOT dependent on the Dread Knight having aggro... he just needs to be in combat with the mob... so it works even if the Dread Knight is not the main tank. This ability does not generate aggro.