Biome stones

These stones would only spawn in rare structures within some rare biome. There are stones forests/plains, snowy biomes, aquatic biomes, and mountain biomes. Each stone is on a pedestal within a rare structure if the stone is taken then and replaced then the biome will turn into the biome represented by the stone. These stones have different abilities depending on the biome they represent. These stones can be destroyed by destroying the biome they were found in. There is only 1 of each stone in the world.