Diablo 4's Season 4: Loot Reborn kicks off on May 14, 2024, bringing a range of changes to systems like the Codex of Power.

source https://www.windowscentral.com/gaming/xbox/diablo-4-season-4-loot-reborn-kicks-off-later-in-may-2024-bringing-big-changes-to-the-codex-of-power-and-more