Halcyon-v0.4.3+aria-of-the-moon.jar is a beta file of the Minecraft mod Halcyon | Data & Essence for NeoForge, made for Minecraft 1.21.1. It was published on August 22, 2026 and is 19.6 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 Halcyon | Data & Essence mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
