Shadowwood and The Temple of shadows

Hello. I have an idea for a new Minecraft biome. The biome is called Shadowwood. It is a dark forest with black trees, gray leaves, and thick fog, creating a scary atmosphere. All mobs in this biome are slightly shrouded in shadows. Skeletons shoot faster, Creepers explode bigger, Zombies deal more damage, and Spiders can place webs. The Temple of Shadows is a dark labyrinth where blindness is always active and strong mobs guard the labyrinth. The main reward at the end of the labyrinth is rare items.