Nightingale

Area 
Makes a door or section of floor “noisy.” A door squeaks loudly when opened; a patch of ground becomes full of snapping sticks when someone walks over it; a floor squeaks, etc. This automatically alerts or awakes the caster if he is within hearing range, and probably alerts others nearby as well (make an IQ roll if there is other noise around).

Duration: 10 hours. 
Base cost: 2 to cast. 2 to maintain. 
Prerequisite: Sense Danger.

Item 
Can be cast on an area of floor or ground, or on a rug.  
Energy cost to create: 100 per yard of radius.