Thanks to dataminers, it seems the first expansion for Diablo IV may be named "Lord of Hatred". This will reportedly focus on Mephisto, a popular character from the game. The speculation arises from the fact that Diablo IV, being a live-service game supported by three development teams, is expected to release major expansions. This information comes at an interesting time as Rod Fergusson, the studio head, recently hinted at possible yearly expansions for the RPG.

The purported expansion might bring players back to the region of Kurast and introduce new questlines, gear, and endgame activities. References have also been found suggesting a new class called Spiritborn and a Mercenary system that could allow NPC companions to fight and level up with the player.

However, as this information is derived from datamining, it's uncertain whether these elements will be included in the final game. Blizzard, the game's developer, is known for altering their plans in response to player feedback.

Diablo IV has experienced significant success since its launch and recently launched its second season of content, Season of Blood. This season provides players with vampire-like abilities and pits them against a formidable vampire lord.