You link yourself to the target undead with an invisible bond of negative energy. As long as you remain within range and maintain a line of effect form yourself to the undead, this bond makes the undead perceive you as an allied undead creature. A non-intelligent undead target ignores you, while an intelligent undead creature assumes you are either some type of undead that appears living or are disguised as living. If used in conjunction with a disguise or illusion to appear undead, this spell gives you a +5 bonus on Disguise checks to fool the undead target. If you attack the target while this spell is in effect, the spell immediately ends.