World of Warcraft's next expansion, The War Within, will introduce a new form of endgame progression called Delves, designed for small groups. It will be the first new form of endgame content since the introduction of the Mythic+ dungeon system in 2016's Legion expansion.

Delves are a new form of evergreen, casual-friendly endgame content that can be accessed in the open world. Described as "bite-sized" adventures, Delves that will scale in difficulty depending on the number of players and can be played solo (with a NPC companion) or with up to four other players. In Season 1 of The War Within, the Delve NPC companion will be a familiar face for longtime players, Brann Bronzebeard, whose abilities and talents can be customized to meet a player's specific needs.

Like Mythic+, raids, and PvP, Delves will offer endgame seasonal progression gear via the game's existing Great Vault system. Players primarily doing Delves will be able to earn seasonal mounts, titles, and achievements, just like players who do other forms of endgame content do. It's a big shake-up to WoW's endgame progression, which has largely revolved around more challenging, group content. It is, however, currently unclear how the item level of gear rewards earned from Delves will compare to that of gear earned from Mythic+ or raids.