clearvoid

No more black void sky. In vanilla 1.16, once your eyes drop below the world's horizon height (y=63 in normal worlds) the lower half of the sky turns black and fog fades to black. Over a skyblock island that happens constantly. Clear Void lowers the horizon to about y=-64, so the sky stays normal all the way down.

Astral Sorcery "constellations only" sky fix (optional, automatic). Astral Sorcery has a setting to draw only its constellations on top of another mod's sky (skyRenderingConstellations in astralsorcery-client.toml). Because of a bug in Astral, that setting never takes effect. Clear Void fixes the check, so you can combine Astral's constellations with e.g. Botania's Garden of Glass skybox. If Astral isn't installed this part does nothing.