RLSC1.jar is an alpha file of the Minecraft mod RLCraft - Structural Core for Forge, made for Minecraft 1.20.1. It was published on May 10, 2026 and is 7.2 MB in size. Pre-release builds can contain bugs — back up your world before installing. For the full description, screenshots and every other version, visit the RLCraft - Structural Core mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
