Detect Survivors (3.5e Spell)

You learn the precise locations of all living creatures in the area. This effect is blocked by any of 1 foot of stone, 1 inch of common metal, a thin sheet of lead, or 3 feet of wood or dirt in between you and the creature. If you have been concentrating on this spell for 2 or more rounds, you learn the locations of any creatures with fewer hit points than your caster level, regardless of obstructions.

Creatures who succeed on a Hide check opposed by your Spot or Spellcraft check are not detected. You get a +10 bonus to this check.