New cave ideas: Bony cavern

The bony cavern is a cave variant often spawning near the Deep Dark and serves as the entrance to it. Coal ore and bone blocks can be found in large quantities in this type of cave. Only skeletons can spawn there, which spawns in large groups (groups of 4-10) no matter what light level it is. The skeletons have a higher chance of spawning with enchanted bow/armor. One skeleton horseman spawns during the cave's generation. The cave can possibly add a challenge to players who are going to fight the warden and those who cannot find skeleton horses.