"If it gets warm, you draw your blade. If it gets hot, you run first and draw your blade second." — Standard Shadowhunter field advice
A flat brass disc etched with runes, roughly the size of a pocket watch. It grows warm when held and vibrates faintly in the presence of supernatural corruption. Detection. The Sensor continuously detects fiends, undead, and creatures under magical compulsion within 120 feet, even through walls and doors. When any such creature is within range, the disc grows warm and a rune on its face illuminates. The Sensor does not specify how many creatures are present or their exact location — only that something is there. Locate the Corrupted. As an action, you can concentrate on the Sensor (as if concentrating on a spell) to cast Locate Creature targeting the nearest fiend or undead within 1 mile. This property can be used three times, regaining all uses at dawn. Interference. The Sensor cannot detect creatures warded by Nondetection or similar magic.
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