Spells to detect anyone sneaking past them. Can be placed on physical objects such as doors.
References from the canon
- After two Nifflers had been placed in her office, Umbridge placed Stealth Sensoring Spells on her door, which detected Harry and Hermione as they broke in to use the fire (OP32)
Stealth Sensoring Spells
Magic Type Magical effect
Incantation none given