Diablo IV could receive a new max difficulty in the future, as a dataminer has discovered evidence of a World Tier V in the game’s files.
Currently, World Tier IV is Diablo IV’s highest difficulty, intended for players level 70-100. Monsters are at their most challenging at this world tier and overcome 40% of a player’s resistances, but also reward more experience and gold. Players are also more likely to find build-defining Unique items in World Tier IV.
But it seems like World Tier IV might not always be the game’s top-difficulty. DatamineARPG, who runs a Ko-fi dedicated to datamining for clues about future content in games like Diablo Immortal and Diablo IV, has discovered files that make it pretty clear that a World Tier V was, or potentially still is, in the works. Official World Tier V artwork does exist in the game’s files, though it could still be a placeholder image. There’s also evidence of a marker that may be pointing towards a capstone dungeon in Fractured Peaks needed to unlock World Tier V.