Sky World
by KURONAMI
Sky World turns the overworld into a vertical sea of floating islands, an Aether-style sky archipelago that replaces the usual terrain for NeoForge 1.21.1 worlds.
What it does
Sky World generates large, widely spaced islands between Y 30 and Y 78, denser and closer together in the layers above, with smaller and rarer islands between Y 212 and Y 242. Between the bands are empty air layers, so the levels read as separate tiers rather than one thick block of sky. Crossings between islands are long, and stepping stones sit near the cloud layer, which stays above the top band instead of cutting through it.
The mod's world generation is powered by Isekai API, which must be installed alongside it. It is required on the server and optional for players. It is published for NeoForge on 1.21.1 only, and its source code is public, but the mod is not open source and is released under All rights reserved. Existing saves generate mismatched terrain along the edge of what was already explored, so a new world is recommended for the current layout.
Key features
Sky archipelago overworld
The overworld is rebuilt as vertical layers of floating islands, with sea and sky shaping the surface of each tier.
Island-relative ores
Ores track each island's own top and bottom rather than absolute depth, so coal sits under grass wherever the island stands, and diamond sits near the underside.
Water and lava sources
Water comes from ponds dug into islands, roughly one attempt per twelve chunks, while lava lakes appear at vanilla's own rate.
Stone turning to deepslate
About twelve blocks under an island's surface, stone becomes deepslate, and deepslate ores generate there too.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Who it’s for: The mod suits server owners and players who want a vertical island world on NeoForge 1.21.1. Each player only needs the client mod if they want the same terrain on their own installation.
Questions
Does Sky World require Isekai API?
Does a player need Sky World on their client?
Will an existing save show the new islands?
In the catalog
Sky World is one of 8,515 World generation mods on ModsFinder, and one of 4,175 World generation mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
More from KURONAMI
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What the author says
Turns the overworld into three bands of floating islands with open void between them, and moves vanilla's ores, structures and mobs into the island rock. Updating from 1.0.0 changes the world. The island layout, the sky colour and the water are all different. Start a new world; an existing 1.0.0 save will generate…
Official listing
- Modrinth page
- modrinth.com/mod/sky-world
- Owner
- KURONAMI
- Published
- 2026-05-29
- Updated on Modrinth
- 2026-09-04
- Facts verified
- 2026-10-15