Back in the shipwreck in which Zoemi was found out by the faceless god, Guide, a certain person walked through the darkness...
Kiorterell, the last living member of the Ghosts of Bellcephora stuck in the body of the half-breed spirit power user that he possessed, bit his lips holding his breath, and approached the star chart on the rotting, moss-covered wall...
He was sure he knew what it was, although George had never seen it, he was told about it by his father.
A star chart allowed the star power user to gain access to the teachings of whichever law they had the potential in, giving the adept the instructions for training on the appropriate level.
There were only a few of those in existence, and all of them were created for the ships transporting active soldiers – despite being extremely hard to create, the star charts were a better investment than actually letting powerful teachers leave their sects and risk their lives out in the uncertain sea expeditions.