Guild Wars is a multiplayer online action role-playing game developed by ArenaNet, a subsidiary of South Korean game publisher NCSOFT, and released in 2005. As the original installment of the Guild Wars series, its campaign was retroactively titled Prophecies to differentiate it from the content of subsequent releases. The game contains a co-operative role-playing portion and a competitive Player versus Player (PvP) portion. In PvP, players may use either their co-operative characters or PvP-exclusive characters who are inherently maximum level and have account-based access to unlocked content.

Guild Wars Factions is a fantasy action role-playing game and the second stand-alone campaign in the Guild Wars series developed by ArenaNet, a subsidiary of NCSOFT corporation. It serves as both a standalone game and first expansion pack to the base game, which is referred to as Prophecies. Simply referred to as Factions, it introduces the continent of Cantha, inspired by East Asian cultures, where two warring factions, the Luxons and the Kurzicks, are locked in a global persistent war. Players are able to join in this conflict, assisting their chosen faction in claiming towns on the game map.