planetcore-1.12.2-1.1.17.jar is a release file of the Minecraft mod PlanetCore, made for Minecraft 1.12.2. It was published on March 20, 2022 and is 13 MB in size. For the full description, screenshots and every other version, visit the PlanetCore mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
