This modpack uses a custom map with a datapack to play Vanilla Skyblock in 1.17.1. It contains custom advancements, mob drops, and more. For more information and instructions, follow the link below. The Datapack was made for a German Youtube Project, so the advancements are not translated to engish.
The modpack does not contain the map since 1.4! Download it from here or downgrade the modpack to 1.0 and upgrade to the newest version again!
I am trying to modify the default world-gen to allow you to generate the world by your own. It is already possible, but if you start playing with a newly created world by default options, the biome is fixed to plains, so you may not be able to obtain any resource / creatures.