Super radioactive metal that turns green in the dark. Used in the Fat Man bomb, only 10kg is needed to reach critical mass (self-sustaining reaction.) If exposed to humid conditions, it can spontaneously combust.
Torch: You have a package...Plutonium!?
Slash: Yep, I was bored.
Slash: It says the guy who discovered it kept it in a matchbox inside his desk. Weird.
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