castle_in_the_sky-1.21.11.1.jar is a release file of the Minecraft mod Castle in the Sky for NeoForge, made for Minecraft 1.21.11. It was published on June 1, 2026 and is 4 MB in size. For the full description, screenshots and every other version, visit the Castle in the Sky mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.