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Geodes
AwesomeDragon97Adds amethyst geodes and an API for making custom geodes.
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pilzmod
Phiia spreading mushroom biome which you can spawn into the world, with its own monsters and a boss you need to slay to stop the biome's growth. Best played with bow & armor mod and after reading manual.
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Pyramids (with treasures)
WuzzyPyramids with treasures!
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Alien Material
debiankaiosAdds new blocks, items, and tools from aliens. A new time begins.
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Wilhelmines Natural Biomes
LiilAdds 9 new biomes
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Ocean
StarNinjasAdds coral reefs, fish, decorative ocean blocks and much more!
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Silver
Jackknifeadds silver ore and tools
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Too many ores
TeufloVThis adds 53 new ores. But most of them are useless.