"Spellfire" can accommodate any number of players with no need for changes to the rules. The players try to put six Realms cards into play, and can play one per turn. Holdings cards can be played on a Realm (one per Realm) to give it special qualities that help defend it from attack. Heroes, Wizards, Clerics, Monsters, Spells, Magic Items, Artifacts, Allies and Events are used to defend a player's realms and also to attack the realms of other players. After a realm is successfully attacked, it is considered razed and turned face down, and can only be restored through the use of other cards.