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You can detect the aura that surrounds Undead creatures. The amount of information revealed depends on how long you study a particular area.
2nd Round: Number of Undead auras in the area and the Strength of the strongest Undead aura present. If you are of good Alignment, and the strongest Undead aura's Strength is overwhelming (see below), and the Creature has HD of at least twice your character level, you are stunned for 1 round and the spell ends.
Lingering Aura: An Undead aura lingers after its original source is destroyed. If detect Undead is cast and directed at such a location, the spell indicates an aura Strength of dim (even weaker than a faint aura). How long the aura lingers at this dim level depends on its original power, as given on the table below.
Each round, you can turn to detect Undead in a new area. The spell can penetrate barriers, but 1 foot of stone, 1 inch of common metal, a thin sheet of lead, or 3 feet of wood or dirt blocks it.