Analog Motion Detection Unit
Wondrous Item, common (requires attunement)
This chunky, off-white plastic device looks like it came from a 90’s home security kit. It has a small frosted sensor window, a sliding power switch, and a red LED that blinks every few seconds. The back is held shut with mismatched screws, and the battery cover is taped in place.
When active in quiet places, it emits a faint electronic chirp—like it’s waiting for something to move.
Sometimes, it beeps even when nothing is there.
Properties
Motion Sweep
As an action, you may place or mount the sensor on a surface within reach.
It monitors a 30-foot cone extending from its front.
If a creature moves through the area:
The device emits a sharp beep and flashes red.
You learn the direction the movement came from.
This functions even against invisible or incorporeal creatures.
Silent Watch
While you are within 60 feet of the sensor:
You cannot be surprised by undead or spirits that move through its detection area.
You gain advantage on Wisdom (Perception) checks to track movement nearby.
Activity Spike
Once per short rest, when the sensor triggers:
You may focus on the reading.
You learn whether the movement was:
Physical
Supernatural
Or environmental (wind, debris, etc.)
Limitations (Old Tech)
Detects only movement, not stationary creatures
Loud sudden noises may cause false triggers
Requires 1 action to pick up and reposition
Malfunction Quirks
Roll or choose:
It beeps in slow patterns like a heartbeat.
The red light stays on a second too long.
It sometimes triggers when someone lies nearby.
The casing vibrates faintly in haunted locations.
Notes: Advantage: Perception, Limitations (Old Tech) Detects only movement, not stationary creatures Loud sudden noises may cause false triggers Requires 1 action to pick up and reposition, Requires Batteries
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