Alarm

Alarm was an abjuration spell.

Effects
The caster picked an area of no more than 20 ft (6.1 m) that when crossed by a creature would alert the caster. When casting the spell, the caster could choose what creatures would not trigger the alarm. The alarm in itself was a "Ping" in the mind of the caster that would wake it if the caster was asleep.

Components
To cast this spell, the wielder needed a small bell and a length of slender silver wire.

Appearances

 * Player's Handbook 5th edition