Alarm
Casterlevel: Brd 1, Rgr 1, Sor/Wiz 1 School: Abjuration Components: Verbal, Somatic Range: Close (25 ft. + 5 ft./2 levels) Area: 20-ft.-radius emanation centered on a point in space Duration: 2 hours/level (D) Saving Throw: None Spell Resistance: No
Alarm sounds a mental and audible alarm each time a creature of tiny or larger size enters the warded area or touches it. In quiet conditions, the ringing can be heard faintly as far as 180 feet away. The sound lasts for 1 round. Creatures within a silence spell cannot hear the ringing.
Ethereal or astral creatures do not trigger the alarm. This spell functions as an invisible area of effect and is subject to being dispelled.