Which expansion introduced the Arena PvP system?

The Burning Crusade introduced World of Warcraft’s Arena PvP system. Released in January 2007, the expansion added structured player-versus-player matches alongside Outland, flying mounts, the Draenei and Blood Elf races, and a level-cap increase to 70.

Arena battles were designed as small-team death matches, with 2v2, 3v3, and 5v5 formats. Unlike battlegrounds, which focus on larger teams and objectives such as capturing bases or flags, Arenas emphasize direct combat and team composition. Rated matches used a ladder and awarded points and rewards based on performance.

The expansion launched with several Arena locations, including the Ruins of Lordaeron, Circle of Blood, and Ring of Trials. This system helped make competitive WoW PvP more formalized and eventually supported major esports tournaments.

A common mix-up is confusing Arenas with battlegrounds. The Burning Crusade added both new PvP content types, but the Arena system itself—not the older battleground format—was the defining new feature. Later expansions expanded Arena seasons, ratings, classes, and tournament play.