Ultranium/Shadow Biome

The Shadow Biome is a biome that generates on world creation, it will always spawn on the left side of the map. Upon entering the biome, the sky will be tinted a light green.

The biome is mostly flat, however a Shadow Monolith will generate in the middle, it has a tower-like structure with tentacles at the top. It serves no purpose other than to look nice.

Under the Shadow Biome is the Dark Depths, however the blocks leading to it cannot be mined until a Pickaxe with 200% Pickaxe Power is obtained, meaning it cannot be accessed until the Mech Bosses are defeated. The rest of the Shadow Biome’s content is in the Dark Depths, as the Rift Artifact is found at the bottom, which is required to summon the Abyssal Armageddon and Erebus.