Barren wastes biome that players can restore

A rare biome in the overworld with barely any vegetation or mobs, the surface would be covered in gravel, dust and dead grass, very grey. When a player completes a certain task (ex, crafts a special device, completes a dungeon, defeats a boss, etc) the biome will be restored to its former glory, with verdant and exotic plants and trees. New mobs would spawn as well, going with the prehistoric look that the sniffer and related plants have. The biome could provide a unique set of wood and plant types, as well as new building resources and unique weapons or tools. In order to restore the biome, deep underneath the biome there would be an ancient buried temple with some special puzzles and a unique boss to fight that will allow players to restore the biome above.