Quantum Shade

The quantum shade was a being that took the form of a raven. It killed people by diving inside there chests. It could chase someone across the universe. It was owned by Mayor Me who used it to execute people in the Trap Street It was instructed to kill anyone with a chronolock (a tatto counting down the minutes until somone dies). Mayor Me instructed the shade to kill Rigsy (after falsely accusing him of murdering Anah) and then wiped his memory so Rigsy would call on the Doctor who would then visit Trap Street. Mayor Me revealed she never intended to kill Rigsy and that it was to lure The Doctor into giving over his confession dial, and that she wasn't behind it all and that an Unknown Force had blackmailed her into doing this. The force also wanted The Doctor to be teleported away to a yet unknown region. As the Mayor attempted to remove Rigsy's chronolock she discovered that Clara Oswald took it. She said the Shade would not cancel the deal to kill Clara since it had been instructed to kill Rigsy and the instruction could only be halted while Rigsy had the chronolock. The Shade then killed Clara Oswald.