The Biome would be not a new Biome on the surface, but an extension below (Maybe an extension deeper then bedrock). The dungeon would be similar to a dungeon in the new mine-craft game. Theses dungeons would be almost like a trap that once you enter it you won't be able to run and works similar to a raid, but instead you must take the offense or you will die/starve. If player/players lose in the "raid" the dungeon remains closed (or for a while). If player succeeds they earn a new artifact that can be used in some way (Maybe involves the end world since no one ever goes in there or can create a new portal to the end, but requires the player to find multiple dungeons?).
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