Dark Detectors are used to reveal more rare Foundables for a period of 30 minutes in specific location by being attached to an Inn (similar to Lures in Pokémon GO, but with a nice little twist).
Players can activate up to three Detectors simultaneously to increase the odds of revealing Severe or Emergency Foundables.
Detectors can be set up at Inns. Rings will appear at the top of the Inns (see image) for each Detectors activated at said Inn. Foundables revealed from a Dark Detector will also have a ring underneath to indicate they have been revealed from an Inn.Players can set up all three Dark Detectors on their own, or do it with their friends. Anyone in reach will see the same Traces/Foundables.