add a new biome to the nether

the biome is called the greystone plains its floor it is covered with a new block called greystone and the reef is covered with blackstone and a new block called nether crystals and are red or purple or orange color and the floor has a new plant called netherium cactus which deals a little more damage than the normal cactus in the overworld and it looks like the cactus it is color orange and also please add this new nether biome to the fourth drop of 2026 and has a its own exclusive mob called greystone zomble and in the floor there is a new tree called greywood which it for making greywood planks and then the greywood set like all wood types