From the middle grade fantasy books, The Bone Grit Historeum
Ring Rivals were those who competed in Trial for the crown of Lanlynne. Anyone could compete and those that passed the initial Juries were given a powerful Rival Ring with which they could then enter Trial.
A Jury of revered Pyrists created a series of physical, mental and spiritual feats based upon the ancient Eternal Virtues of Lanlynne. By the end of Trial, one Rival was to emerge victorious, having gained all the challengers' Rival Rings. He or she would then become the new monarch of Lanlynne.