Sentry of Helm

Sentry of Helm was a divine conjuration spell used by priests devoted to Helm, enabling them to aid in guard duty.

Effects
This spell created a shapeless face that assisted in guard duty while others were sleeping. The caster sprinkled sand around a perimeter while casting this spell then promptly fell asleep. The conjured sentry would wake the caster if any visible object not present when the spell was cast larger than in length crossed the perimeter. This would also end the spell, but the caster would awaken alert and knowledgeable that something had crossed the perimeter. Sentries conjured by a caster with a degree of skill also had infravision to aid them.

Components
In addition to verbal and somatic components, this spell required as material components the priest's holy symbol and a small bag of fine sand to cast.