Sapphire biome

Title: New Underground Biome: The Sapphire Cave and the Larch TreeDescription: I propose a new deep-slate biome called "The Sapphire Cave," featuring glowing blue sapphire crystals and geodes.Environment Mechanic: It is a freezing cave. Staying inside for too long triggers the freezing effect (like powder snow). Players must use torches or leather armor to stay warm.Mobs: Hostile wild wolves that guard the cave.Unique Flora (Larch Tree): An underground tree adapted to the cold with a unique aging mechanic. When freshly grown, the wood and planks are reed green. As it matures, it shifts into a dark reddish-brown color, giving builders two color palettes from a single tree.Reward: Sapphire shards can be crafted into a new armor set that grants immunity to freezing damage and prevents sliding on ice.