Frailstone Caves would be a fairly common cave variant found primarily directly above other, larger caves. The floor of this cave biome would be partially constructed of extremely frail stone (hence the name), which cracks and breaks under the weight of entities and players. This makes traversing this biome incredibly dangerous, because one wrong step and you could fall down to whatever cave system is below you. However, the same reason these caves are dangerous, is also why they're useful. For one, the frail stone that makes up the floor of this biome is handy for traps (however you will need silk touch), but also if you find one of these biomes you'll know there's likely a larger cave system directly below you.
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