This page contains a list of tools that can be used for modding. Some are duplicates, we have many options for different tasks.

Used For: All Modding
Download: https://www.unrealengine.com/en-US/unreal

Unreal Engine is bundled with the Epic Game Store software. You'll need to specifically install version 4.22.3 of Unreal Engine in order to mod Bloodstained.

Used For: 3D Modelling
Download: MirrorPluginToolbar for Unreal 4.22

This is an Unreal Engine plugin that generates a “mirror table” for 3D character models. This is necessary for modifying characters and enemy 3D models in the game that flip left/right (almost ALL of them), in order for the animation to not break.

Used For: All Modding
Download: QuickBMS

The first step to any mod of the game is to extract the game's pak file into a directory of uasset files so you can replace the uasset files individually. The QuickBMS software does this.

Used For: 3D Modelling, Animation
Download: https://www.gildor.org/en/projects/umodel

UE Viewer allows previewing the game's 3D models and animations (that are stored in uasset files). It also lets you extract them to psk/psa files which can be edited in your 3D model editor of choice.

Used For: Asset Extraction
Download: https://fmodel.app/

FModel can be used to view and extract assets from the game, it's an alternative to UE Viewer.

Used For: Editing Assets Directly
Download: https://github.com/atenfyr/UAssetGUI/tags

UAssetGUI can edit .uasset files directly. This can be particularly useful for making quick edits to data tables. It can also export data tables to JSON files and reimport from JSON if you want to write a quick program to make broad edits to the table.

Used For: All Modding
Download: UnrealPak

UnrealPak is one of many options to bundle your modified uasset files back into a pak file which can be used by the game.