Ruins (Structure Spawning System) is a release file of the Minecraft mod Ruins (Structure Spawning System), made for Minecraft 1.12.2. It was published on May 19, 2018 and is 0.2 MB in size. For the full description, screenshots and every other version, visit the Ruins (Structure Spawning System) mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.