Mantle Core is the free authoring plugin for Mantle. Build a place in an ordinary Unreal level, check it, test it in the Mantle game on your own PC, and publish it for players to join.

• Build places from meshes, lights, your own assets and Fab packs, with Mantle actors for spawn points, weapons and vehicles.

• Check your work with “Check this place”, which explains anything Mantle can’t publish and how to fix it. Scripts and UI documents are checked too.

• Test Locally runs the level you have open in the Mantle game on your PC, with its scripts and UI. Nothing is uploaded.

• Convert with Epic’s tools: turn avatars, clothing, hair and emotes into Mantle avatar items with MetaHuman Creator, IK Rig, Groom and glTF Exporter, and turn cars into Mantle vehicles.

• Save and publish drafts and revisions straight from the editor.

• Script in Luau, TypeScript, JavaScript or Python, or visually with Script Graphs.

Requires the Mantle game (free on Steam or the Epic Games Store) on the same PC for Test Locally, and a Mantle account to publish. Scripts run in Test Locally, not in Play in Editor.

Dependencies. Mantle Core uses Epic plugins that ship with the engine, and turns them on in the editor only: glTF Exporter, IK Rig, Geometry Script, Groom, MetaHuman SDK, MetaHuman Core Tech, Chaos Cloth Asset Editor Core, and two that Epic marks as Beta: MetaHuman Creator and Chaos Outfit Asset.

Experimental dependency. Mantle Core lists Epic’s Toolset Registry plugin, which Epic marks as Experimental, as an optional dependency. It’s off by default and only used for Mantle’s optional AI agent tools, which also need Epic’s Experimental Unreal MCP plugin. Without them, Mantle Core works the same. If Epic discontinues Toolset Registry, only the agent tools are affected.

Documentation: https://mantleplatform.com/docs/creators/plugin/