eXc Skyblock Builder

Adds a Skyblock world type to the world creation screen: an empty void overworld with a small starter island. Nether and End stay completely normal.

Presets

Preset	What you get
Only dirt	A single block of earth. Nothing else.
Dirt with tree	One block with a tree on top. (default)
Small island	A small island with 1–3 trees.
Classic	Small island, one tree and a starter chest.

Void overworld as a proper world preset — appears in the world type button, no datapack juggling
Starter island is built once, on first world load, and never rebuilt
World spawn is set automatically
In-game config screen via Mod Menu, or edit config/exc_skyblock.json by hand
Five tree types: oak, birch, spruce, jungle, acacia
Fully configurable starter chest contents (item IDs and counts)
Works in singleplayer and on dedicated servers
English and German translations

Option	Default	Description
`generateIsland`	`true`	Build the starter island at all
`preset`	`DIRT_TREE`	`DIRT_ONLY`, `DIRT_TREE`, `SMALL_ISLAND`, `CLASSIC`
`preselectWorldType`	`true`	Preselect Skyblock in the create-world screen
`islandHeight`	`64`	Y level of the island surface
`grassTop`	`true`	Grass block on top instead of plain dirt
`treeType`	`OAK`	`OAK`, `BIRCH`, `SPRUCE`, `JUNGLE`, `ACACIA`
`islandRadius`	`4`	Radius for the island presets
`islandDepth`	`3`	Number of dirt layers
`treesMin` / `treesMax`	`1` / `3`	Tree count for Small island
`chest`	`true`	Starter chest in the Classic preset
`chestItems`	see below	Lines of `item_id count`
`setWorldSpawn`	`true`	Move the world spawn onto the island

Settings only affect newly created worlds.