Wailing wind

By means of the wailing wind spell, a priest creates a magical warning system. When any creature larger than a common honeybee enters a guarded area (a passage, chamber, cavern, doorway, or cave mouth of up to the area of effect), a wailing, whistling blast of wind blows from the guarded area toward the casting priest. The priest designates the area to be protected verbally, and must be standing near the area to be protected when the spell is cast.

The wailing wind travels toward the caster as long as he or she is on the same plane as the guarded area. The wailing wind has a distinctive tone that can be heard by all creatures capable of hearing. It transmits and magnifies any sounds (speech. movement, etc.) made by the triggering being at the time it is activated, and thus it may give any listener a clue as to what sort of intruder approaches. If the caster is powerful enough, a wailing wind can be activated more than once.

This spell originally appeared in this form in Faiths and Avatars for the AD&D game from TSR. Its use here is for the purposes of providing context for the campaign only.