Simms is a Runeseeker who had been seeking runes in Shadetale. He stumbled upon mist and ended up in the Spirit World. He believes he has figured out how to escape, requiring a musket ball, which the Wolf promises to give to him. However, when he returns with bullets, the Wolf realizes that Simms' way to escape is via suicide. He takes out a gun and shoots himself in the head.
He makes an appearance outside the tavern in the second episode of Kingdom of Liars, showing that his way to leave the Spirit World worked.