ReFusion

An in-process reimplementation of NynrahGhost's Fusion with faster merging, smaller output, compatibility validation, and full Unicode path support. Benchmarked around 4-11x faster, with an 82% smaller output pak.

Mod users

Install it and launch the game normally. It works as a standalone replacement or alongside the original Fusion dependency, which it safely takes over from. Existing Fusion-based mods work without changes.

Mod authors

Depend on ReFusion alone for new mods, or on both packages when supporting existing dependency chains. It follows the same Fusion conventions.

Fusion mods are standard pak patches: they provide cooked assets at the same relative paths as the game's assets, and UE mounts them as replacements. You can use this to replace whole assets as usual; ReFusion only merges datatables and inputs that follow the conventions below. See Epic's UE 4.27 patching guide for the underlying system.

For datatables, pack the .uasset and .uexp under:

<Project>/Content/Mods/<YourMod>/_Content/main/datatables/_<table>.*

Keep the leading _ on the table name - for example, _list_props.uasset and _list_props.uexp. Pack DefaultInput.ini normally for input merging.

Credits

• NynrahGhost — Creator of the OG Fusion, which still works today. ReFusion wouldn't exist without it, and the original still remains an option.
• Icon mesh — “Ferris the crab” by tuxlu, licensed under CC BY 4.0. Atom rings and background by me.