The withered desert would be a place that is barren and desolate. A new hostile mob would be the Nethermite, a small black mob that is hostile and gives you the nausea effect for 12 seconds. The majority of this biome would be made of witherrack and soul sand and growing around would be the strange fungi, which also gives you nausea, and sometimes glowing. Inside the withered deserts would be small ravines in the ground called radiation leaks, which deal damage and the radioactive fumes would be obtainable in a bottle.
Another biome idea is the dark, soul caves, hosting the rare mob, the glow worm hanging from the ceilings, which can make potions of glowing. More ideas for biomes would come to you, but I suggest more flora.
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