caves-of-cobalt-BETA-0.6.1.jar is a beta file of the Minecraft mod Caves of Cobalt, made for Minecraft 1.15.2. It was published on April 11, 2021 and is 24.9 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 Caves of Cobalt mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.