NetherBlocks Add-on 1.17+

The developers of the Nether Plus addon decided to add new blocks for this build. They did not update the addon, but simply created a new NetherBlocks mod. The add-on contains a lot of different blocks, that will appear in the Nether World. To get all the blocks at once you can write the command /function blocks. Do not forget to activate the experimental mode and download the main build.