Bone caves

A cave made from bones tuff and deep slate with bone spikes that are like drip stones but only placed on the ground and a skeleton variant called the decayed which is a skeleton with decaying bones and ash sparkling down from it and it attacks using ash which is a substance that can make your screen full of ash for 14 seconds also ash can be an item scattered around the cave but can only be placed on the floor aswell and these caves can only be found below deserts and badlands (this idea was brought to you all by cave ideas for Minecraft #I think caves can have variants for biomes