Overview
Hearths is a world-generation addition that fills the Nether with new structures and natural decorations, giving the dimension far more to find and explore. It scatters brand-new landmarks and ambient features across the Nether's biomes so travelling through it feels like a real journey with places to discover. Because it is data-driven world generation, its content appears automatically in newly generated Nether chunks - you do not have to craft or set anything up.
Reference
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Kult Craft Core Data Pack