Faerie Fire was the only published genre source book for the GRS: General Roleplaying System. Characters in Faerie Fire vary from the base system in some details. Characters have Attributes (Strength, Intelligence, Charisma, Stamina, and Dexterity) with numeric values distributed from a point pool. Characters have standard Skills (Occult, Brawl, Dodge, Common Sense, Martial Arts, and Resources) with number values distributed from a second point pool. The characters are all assumed to be fae (fairies) hiding among humanity. All fae can create magical effects (cast spells).
The action resolution system uses a stripped pack of playing cards, as in the core system. Combat is resolved in the same way.