Servants of Undeath Flee before the twin lights of Order and Purity.
This spell causes all Undead with less than 250 hit points to have to flee from the area of effect and travel no less than 100 yards from the caster at the fastest rate they can.
During this time these Undead may not do anything other than defend themselves from incoming attacks.
They may not attack others while fleeing and must pass the 100-yard mark before they can turn back. Though for 10 minutes they may not return within 10 feet of the caster, nor may they attack that caster.