invalid_modjar-1.4.0-neoforge-1.21.1.jar is a release file of the Minecraft mod invalid_mod.jar for NeoForge, made for Minecraft 1.21.1. It was published on May 30, 2026 and is 24.1 MB in size. For the full description, screenshots and every other version, visit the invalid_mod.jar mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
