Since Meltan is currently unavailable outside of getting booster packs, because smelting is only from old versions of the mod and mystery boxes are too op in terms of ditto, I suggest we add it to the legendary spawn chance, its not up to me what biome you put it in but I think it fits most in Badlands under Y 40 so that it only spawns underground, this would make sense because Meltan absorb metel and badlands have higher chances of spawning gold.