The Crystals are just for decoration, nothing will be made out of them. Gloomstone is just a gloomy variation for Soulsand Valley and a future biome. I originally planed to add it later, but when I found out how to generate the biome specific nether ceiling I added them to make the experience better. You can disable the spawning of Gloomstone to generate Glowstone in the Valley instead. The config is just for the valley tho
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