RWG is a paid world generator
RealisticWorldGenerator allows you to easily generate a really cool looking world. Oraxen is not supported by the plugin (this means that the plugin does not contain any specific code for oraxen, allowing you for example to use Oraxen items in the default loots like dungeons, villages, etc) but this supports custom BlockDatas, so you can add custom minerals created with Oraxen to be generated like diamond for example. Spigot Link: https://www.spigotmc.org/resources/realisticworldgenerator.15905/
First you need to decide on which world you want to add your new ores (or create it). When you are ready, restart your server. A new folder inside ./plugins/RealisticWorldGenerator/worlds should have appear. You can now open it and find some files called "ores.yml", "biomes.yml" and "replacement.yml".
Depending on which version of RWG you're using there are different ways to add custom blocks to RWG. If you're using a version lower than or equal to 4.26.5 then you need to follow the guide exactly beneath this sentence. If you're using a version higher than that you need to follow the guide below.
You need to find your custom block data. This can be achieved using any minecraft version on a server running Oraxen. Just place your block (you can get it from the oraxen inventory of give it to yourself through a command) and press F3 while looking at the block you want to add.
You can now easily add your new ore to the generation. In our example, this should look like that:
material: minecraft:mushroom_stem[up=false, down=false, north=false, south=false,
After opening the file you only need to add the block you want to add with the "oraxen:" namespace infront of it instead of "minecraft:" This can look like this:
When it's finished, save the file, stop the server, deletes your old region files and restart the server.