Tuus is a very bright star that serves as the south celestial pole star for the world of Cauix. It is the outermost star in the open cluster known throughout Aesedra as the The Five's Guidance. In astronomical terms, it is a A-class white sub-giant approximately nine light years away. This gives it a visual magnitude of -4.3, enough for it to cast a shadow. Due to its declination, it is invisible from most of Aesedra except at the southern reaches of Yolbein.