This chapter's epigraph comes from a poem by the same name. It's a poem about a tortoiseshell, a creature that lives in the middle of a giant tortoiseshell. The poem describes the tortoiseshell as a kind of shell that holds all of the creatures in it. In other words, it holds all the creatures that live in the world. The tortoiseshell is the most important thing in the poem because it's the only thing that can hold all of these creatures in one place. It also holds the key to the game of "The Great Tortoiseshell Technique" , which is a game that the goddess Black Tortoise created for her four divine beasts. Black Tortoise left the game to his "heir of the bloodline" . This means that Black Tortoise's descendants are the ones who will inherit the game from him. This is the first time Black Tortoise has ever been able to play the game, and he's not the only one who's had to play it.