Epic Fight cancels the use of any offhand item whenever the weapon in your main hand is in a style that cannot use the offhand. That includes the two-handed style of every greatsword. This happens even after you switch Epic Fight to vanilla mode, so you cannot block with a shield while holding a greatsword.
Vanilla Offhand Fix runs after Epic Fight's own handlers and reverses that cancellation, but only when:
- the player is in Epic Fight's vanilla mode, and
- the item being used is in the offhand.
In battle mode nothing changes, and Epic Fight behaves exactly as before.
Details:
- No items, blocks, config files or commands are added.
- Requires Epic Fight. Install it on both the client and the server.
- Tested with Epic Fight 20.14.17 on Forge 1.20.1 (47.4.23).

