Glister

Glister is one of a pair of rare Elf twins. Along with her sister Gleam, the pair were acrobats who worked at the Witchlight Carnival as a star attraction. Gleam always wears a silver moon mas, while Glister wears a golden sun mask. They left long ago to seek an audience with Zybilna of Prismeer, but they ran afoul of Zybilna's wretched Hag sister, Endelyn Moongrave.
The hag took the sisters prisoner, kept Glister as her "guest", and then exiled Gleam to avoid the sisters, as the living embodiments of moon and sun, from forming a symbolic eclipse, as her death is prophecised to happen during an eclipse. Glister remained trapped at the Hag's fortress of Motherhorn, seeking to escape and be reunited with her sister that they might return to the Carnival. Happily, with the aid of the Witchlight Court, they were able to leave Motherhorn and go home together.