iron-1.5.2.jar is a release file of the Minecraft mod Arkia's IrON, made for Minecraft 1.12.1, 1.12.2. It was published on February 6, 2018 and is 0.3 MB in size. For the full description, screenshots and every other version, visit the Arkia's IrON mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
