After finishing the World's Grave mission on the Moon, players can explore a rock-like formation on the right side of the room to find a chest holding the Jade Rabbit insignia, which is more than just a snazzy-looking, rabbit-themed badge. The Jade Rabbit, also known as the Moon Rabbit, is a famed figure among Chinese, Japanese and Korean folklore, a rabbit who lives on the moon and creates herbs for the immortals. So you see, this isn't just a cool emblem: it's also steeped in a wealth of cultural history, if that's your sort of thing.