Battle Realms: Winter of the Wolf is a stand-alone expansion to Battle Realms, so it doesn't require that players own the original game. The expansion adds new structures, units, and heroes for each of Battle Realms' four clans. It has 12 single-player campaigns and 30 multiplayer maps. The prequel's 12 new scenarios take place seven years before the events depicted in the original game, and they reveal how the Wolf clan, one of the game's four playable factions, rose from slavery under the Lotus clan.