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Blizzard has explicitly stated they have no plans to support an offline mode, even for the solo campaign. Workarounds for Common Offline Needs
The game features a rotating cosmetic shop and seasonal Battle Passes that rely on a constant connection to track purchases and progress. Can You Bypass the Online Requirement? diablo iv offline mode install
Global events like World Bosses and Legion Events require a live server to synchronize dozens of players in the same instance. Blizzard has explicitly stated they have no plans