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I’m making my own server and I can’t figure out how to place mineable Adimantium ore
External link →I’m making my own server and I can’t figure out how to place mineable Adimantium ore
External link →It sounds like you're looking at guides for creating a server, but what you want/need to do is create a custom map.
If you are already creating a custom map, "Adamantium Ore" is not a vanilla feature. You need to either install a mod that has that, or you need to mod the game and create this yourself.