neoforge-1.21.1-8.1 is an alpha file of the Minecraft mod Ad Astra: Giselle Addon for NeoForge, made for Minecraft 1.21.1. It was published on August 18, 2026 and is 0.5 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 Ad Astra: Giselle Addon mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
