"The Origins of Snagthorn the Mystic" is a standalone short story set in "The Misadventures of Morga Skullsplitter" universe.
Snagthorn pops up in the first couple of episodes of Morga (visit this link or this link to read it for free), but there's no need to have read those to enjoy this tale. However, those who have already entered the world of Morga may be excited to find that good ol' Snaggy isn't quite what he initially seems to be!
