Trials of succession
Koriani knowledge is stored in two powerful crystals that originated elsewhere from the planet of Athera. Because of restrictions imposed by the Compact, the Koriathain cannot clear the crystals without losing irreplaceable knowledge. As the crystals age, their heavy use overburdens them with excess energies that must be mastered by the Prime, and the trials of succession become harder. Only a perfectly faultless person is able to master the most virulent crystal, the Great Waystone.