{The way I read the spell description, the lingering aura only comes into play when the undead creature is destroyed. Sort of a discharge of the pent-up necromantic magical energy. It doesn't appear to be a way to track an undead creature based on a sort of aura contrail it leaves behind.}<br/><br/>Adrian detects two undead auras within sixty feet. They seem to be inside the building. They are both strong auras.<br/><br/>The tressym goes flying around, trying to spot any kind of undead aura. {Zaer, since the second warehouse's doors open to the east into a street, would the imp turn north or south first?}