Fake Riokillius Mask

Summary
This mask is an exact replica of Spring-Heeled Jack's mask that was truly the demon Riokiullis.

History
Following the death of Spring-Heeled Jack, Riokiullis wanted to escape Jack the Ripper, as he had already received a mortal wound from him. After the murder, Riokiullis stayed in the form of the real mask until Jack left, and, to avoid suspicion and to throw The Ripper off should he try and track Riokiullis, Riokiullis left behind this fake decoy of a mask.

Retrieval
After being found by police two days after the murder, along with the body of Spring-Heeled Jack, the police were concerned as they had seen the effects of the actual mask, so they brought in death row prisoners to retrieve the mask, and found it was a decoy with no effect. It was put into a museum, and eventually stolen during a massive heist, and ended up in Ten Beard's vault.