Lost Sky Islands

Overview

The "Lost Sky Islands" datapack (also available as a mod) adds clusters of sky islands to your Minecraft world. These sky islands are generated as Minecraft structures and can vary in size. You can find ruins of some lost civilization on these islands, some of which may hold valuable treasures. If you ever feel bored living on the ground, you can also use the islands to start a sky base.

This datapack is balanced against vanilla progression. The block palettes are also chosen to better fit vanilla worlds (e.g., wool blocks are only used in building parts where they make sense, not in general terrain texturing). Therefore, adding this datapack shouldn't break the vanilla experience.

This datapack is also designed to allow easy customization, so you can tweak it to fit your play style, or to better integrate it in a modpack.

Installation

Datapack File (.zip) Installation

• For single-player worlds, simply add the datapack during world creation and

enable it just like installing other datapacks.

• For servers, put the datapack in the datapack folder within your world

folder.

Mod File (.jar) Installation

You can easily install it like other mods by putting the .jar file under your Minecraft instance's mods folder. Supported mod loaders include Forge, NeoForge, and Fabric.

IMPORTANT: For Fabric, you also need to install Fabric API.

Compatibility

Minecraft Compatibility

This datapack supports Minecraft versions from 1.21.1 to 26.3.

Mod Compatibility

Since this datapack only adds new structures in the sky, it should be compatible with common worldgen mods. Although the sky islands may look a bit small if you use mods like Tectonic, because they are designed around vanilla scale.

If you use another mod/datapack that also adds structures in the sky, there is a small chance of overlapping structures.

Permission

Feel free to include this mod/datapack in your modpacks.

Although the license is ARR, you're permitted to customize the behaviors of this datapack without directly modifying the original .jar or .zip file by creating another datapack or use tweaker mods. See the "Customization" section below for more details.

Customization

To customize the behaviors of this datapack, you can create a new datapack to override JSON definitions in this datapack (you need to make sure it loads after this datapack/mod), or use more advanced tools like KubeJS.

When not explicitly stated, all JSON or structure NBT file paths below are relative to the data folder in the datapack.

IMPORTANT: Overlays are used to support multiple Minecraft versions. Depending on the Minecraft version you are using, you may need to use files from the corresponding overlay for reference. For example, if you want to override lostskyislands/worldgen/placed_feature/cave_ore_rare_1.json, for Minecraft 1.21.10, you can simply refer to the file under the root data directory as the baseline. However, for Minecraft 26.1, you will need to refer to the same named file under the overlay directory patch_26_1 as the baseline.