For the most accurate gameplay data, you can refer to the official Patch 2.6 Release Notes Blizzard News

The update is not on the cart – you must download it (approx. 2.5 GB). After updating, you can play offline, but the patch is required for online features.

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This update focuses on maintaining a steady frame rate during high-particle events, such as a Sorceress using Blizzard or a Paladin’s Blessed Hammer chaos.

Fixed an issue where the boss's lightning attack failed to hit players standing at point-blank range.