Also available in Arcanum Unbounded: The Cosmere Collection.

"This story was written specifically for the Mistborn Adventure Game, a tabletop RPG. Please keep in mind that the story was intended to help a GM bring his players up to speed on the world if they haven’t read the books. There are a few goodies for those who want to know more about Kelsier, but this story is not meant to stand wholly on its own."
~ Brandon Sanderson.