石のような物体 (Ishi no You na Buttai,The Stone-Like [Object]) is an octahedron-shaped artifact and central antagonist of the legendary Treasure shoot 'em up, Radiant Silvergun. It is the guardian of the Earth and oversees the advancements of the planet and its inhabitants. If it deems that the world must start over, it will destroy the planet so it starts anew. It later made an appearance in Radiant Silvergun's spiritual successor, Ikaruga. In Ikaruga's story, it has an alternate name: 産土神黄輝ノ塊 (Ubusunagami Ouki no Kai)
