By invoking Mórr's protection and sprinkling the recipient with Graveroot, this spell makes the caster or one other living creature of the caster's choice undetectable to the senses of Undead creatures. An Undead creature must make a successful Int test or be unable to see or hear the person or creature upon whom the spell is cast. Undead who are ordered to attack a creature they cannot see must immediately make a stupidity test, even if they are not normally subject to stupidity.