Sláine: The Roleplaying Game of Celtic Heroes is a fantasy role-playing game (RPG) designed by Ian Sturrock, and first published in 2002 by Mongoose Publishing. The game is currently out of print. It was derived from Sláine using the d20 System. The franchise was transferred to the Runequest rules system in 2007. The rules were meant to be convertible and much of the background information has been transferred verbatim, as has the format and borders of the pages.