Nether biome/layer Plutonic depths

This would generate below the normal nether and would go down to -64 in the nether It would be made of a new block called plutonic stone throughout this layer there would be caves around 12 blocks wide at most and and at minimum 5 instead of lava there would be a new liquid sulfuric acid which would kill players faster than lava there would be 2 new mobs the first mob would be a hraxon a medium bat like mob That would swarm the player they are afraid of loud noises and will retreat for a short time if they hear one the second mob a rolly Polly looking creature called the nether grub which is passive would wander the caves if you kill this mob it will drop nether grub which can be eaten but has a chance of poisoning the player the hraxon would also prey on this mob