Gilles de Rais' Key Ring

Origin
This brass key ring originally belonged to the leader of the French army during the Hundred Years' War and a serial killer whom many of his victims were children. The keyring itself gave partial inspiration to the fable of Bluebeard.

Once Gilles would kill his victims, he acquired a trunk with a lock and key from a local shoppe, place his victim inside the trunk and then bury it deep in the french woods. After doing the dark deed, he placed the key of the lock onto the brass key ring as he had the constant fear that if he tossed the key somewhere, then someone would find it and recognize the key for the lock. So he kept them all. With every victim he killed, he placed a new key onto the keyring. Eventually, he was tried and caught, after his hanging and burning the keys were lost for sometime.

Effects
The key ring and keys were imbued with the constant reminder of his past mistakes and lives he costed with these keys.

Shaking the keys, sends out ultra-sensitive waves that penetrate the ground and reveal underground structures or bodies buried in the ground. Coming back visually to the user.(Like a bat using sound waves to see) But, it sends out a wave of guilt that may overwhelm the user for a period of a few minutes. Eventually, the user will faint from extended use.

Every two months, the keys will have to be shaken to relive built up energy. Which will start to manifest around other artifacts.

Collection
This artifact was collected after a suddenly famous archeologist, started to faint at random times almost killing himself. C. Poole and J. Whithead collected this artifact in 1894 in Egypt.