Master Chief and the Arbiter vs. 5 waves of Covenant in Paint the Town Red's arena, voxelized from your own Halo MCC. Co-op for 2.
Covenant Assault turns Paint the Town Red's Arena into a Halo mission.
Nothing from either game is shipped. On first launch the mod reads the Halo 3 models (Chief, Arbiter, Grunt, Jackal, Elite, Hunter and the weapons) from your own Halo: The Master Chief Collection and converts them into voxels on your PC.
How to play: Arena → Challenge I is Covenant Assault. For co-op: Arena → Co-op → Host Game → Arena / Challenge 1 → Create Game, then Invite Friend.
Needs both Paint the Town Red and Halo: The Master Chief Collection installed. Online leaderboards are switched off while Covenant Assault runs.
Credits: BepInEx, HarmonyX, Il2CppInterop (bundled loader); Reclaimer by Gravemind2401 (GPL-3.0) for reading Halo's map files. Halo belongs to Microsoft and Paint the Town Red to South East Games; this fan mashup isn't affiliated with either.