As Mojang updates Minecraft new biomes, items, and blocks are introduced to the game. The Deep Dark biome was added to Minecraft with the Wild update in June 2022, bringing with it Ancient Cities ...

The Deep Dark Explained The deep dark biome can primarily be found deep underground mountains in the Overworld. The telltale sign of deep dark biomes are the dark blue, moss-like sculk blocks.

If you move to another biome and place one, the Warden will not be summoned. So overall, the Warden doesn't just spawn freely in the Deep Dark, but he is tied to an item that can only be found there.

The Deep Dark is one of the more frightening biomes out there, located deep underground. Due to being under the surface, you won't just be able to fly around and spot it from above.

Deep Dark Chamber (Java) Seed Number: -8539506224916838806 This is the coolest Minecraft 1.21 ancient city seed. It will spawn you in a hostile environment surrounded by snowy and frozen biomes.