It's Astral Sorcery. And I can't live without my Halcyon Days skybox... Add the overworld (0) to this section: Code: # IF a dimensionId is listed in 'skySupportedDimensions' you can addAmount it here to keep its sky render, but AS will try to render only constellations on top of its existing sky render. [default: ] S:weakSkyRenders < 0 > Not sure how it works when there's supposed to be an eclipse, as I've just gotten it working. Hope this helps. Got it from this post on reddit.