Custom Dimension API Add-on 26.0+

Want to create your own dimension in the world of Minecraft? The mod Custom Dimension API is a powerful tool for creating custom dimensions using scripting and object-oriented programming.

With it, you can customize terrain generation, add unique portals, change the structure of the world, the placement of mobs, ores, and various objects. It also supports choosing surface materials and the dimension height, which makes it possible to create completely new worlds.