Appropriately, a Shun is some of the "stuff" players are questing for.
After reaching a certain level, your reward "stuff" is a Shun. Here's how it's described in the game: "It's not just any blade, it's a Shun knife. Finest kitchen knife on the market. Crazy sharp, too. That's actually how I lost this hand in the first place."
This is definitely a first for us. Quest on, Armageddon Stan and Apocalypse Peter!