Deathwatch

Using the foul sight granted by the powers of unlife, you can determine the condition of creatures near death within 30 feet of you, as well as where the creature is located. You instantly know whether each creature within the area is dead, fragile (alive and wounded, with 3 or fewer hit points left), fighting off death (alive with 4 or more hit points), undead, or neither alive nor dead (such as a construct).

The spell can penetrate most barriers, but it is blocked by 1 foot of stone, 1 inch of common metal, a thin sheet of lead, or 3 feet of wood or dirt.

Deathwatch sees through any spell or ability that allows creatures to feign death.