
Diabolical Islands
Datapack that creates Nethers with the same floating island generation of Aetherial Islands.
Screenshots






About this Mod
Diabolical Islands
The sister-pack to Aetherial Islands, this world generation datapack changes the Nether to be composed of the same wonderful floating island generation found in Aetherial Islands, but this time in the Nether above a vast sea of lava!
With this datapack, you'll be able to experience soaring islands, flat plains and caves. Structures on rolling hills, and more.
All of the structures and biomes generate with this world type, as they should.
Important Notice
This pack modifies the Dimension's height, which means that you cannot just simply remove the pack from your world after it is created. Create worlds with caution. Additionally this removes the bedrock ceiling and floor. There is nothing under the lava except void.
Shoutout to LNXS!
I have been delaying this project for... quite a while. However, LNXS asked me about a Nether version of Aetherial Islands and offered to commission it for me, and to help take the gallery photos and make the pack icon. Without his help I probably would have delayed this project even longer.. :D
Check him out on YouTube!
Want less islands / island clusters?
(WIP: Support coming soon!)
Check out the Aetherial Islands: Clusters Edit
Compatibility: Does this work with insert mod name here?
If that mod changes the terrain, one of the mods will probably overwrite the other. If that mod adds biomes, it should be compatible.
Sponsor: Sparked Host
Available Versions
How to Install Diabolical Islands on Your Server
Order Server
Order a Minecraft Java server with at least 4 GB RAM (6 GB recommended).
Set datapack Loader
In the panel under "Egg", select the datapack loader and matching Minecraft version (1.21.11).
Install Mod
Open the mod browser in the dashboard and search for "Diabolical Islands". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.11, 1.21.10, 1.21.9 (+79 more)
Server-side
✓ RequiredRecommended RAM
6 GB(min. 4 GB)Frequently Asked Questions
Diabolical Islands server crashes on startup – what to do?
Most common cause: wrong datapack version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 4 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.
Is Diabolical Islands compatible with datapack and fabric and forge and neoforge and quilt?
Diabolical Islands officially supports datapack, fabric, forge, neoforge, quilt for Minecraft 1.21.11, 1.21.10, 1.21.9. Note: Forge and Fabric mods are NOT cross-compatible – pick one loader and stick with it. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Diabolical Islands – how to optimize performance?
Recommended RAM: 6 GB (per 5 players). Use /spark profiler to check if Diabolical Islands consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Rent Modded Server
Install Diabolical Islands with just one click on your server.