Robert Liston's Green Coat

Origin
Robert Liston was a surgeon famed for his speed handling a scalpel. Before the advent of widely used anesthetics and painkillers, faster operations meant less pain and a higher chance of survival. Known as “the fastest knife in West End”, he could amputate a limb in several minutes, although he bragged about accomplishing the same feat in 28 seconds. Liston’s most famous case involved the amputation of a patient’s leg, which resulted in death from gangrene due to lack of sterilization. He then amputated his assistant’s fingers, who died from the same cause. Finally, while he was swinging his knife around, he accidentally slashed the coat of a spectator; although physically untouched, the man dropped dead from fright. This is the only recorded operation in history to have a 300 percent mortality rate.

Effects
The user’s health is boosted, as the coat strengthens and renews the antibodies in the immune system. However, it is liable to accidentally causes a similar outburst in onlooker’s limbs, instead causing sudden shock to the entire body resulting in death. During use, time slows around the user for a period of two and a half minutes.