Erin is a skirmish-level, miniatures wargame based on the "Invasion Cycle" of Celtic Ireland. It is designed to be used with Alternative Armies' range of miniatures. All of these are intended to portray the feel of accurate Celtic Mythology. Ancient magics, old gods and monsters from the mists of time are common in the land Of Erin as well as mere men and women.

Factions include: Milesian, Fomori, Sidhe, Fir Blog and Nemedians.