Dominura

Dominura is the eldest of all Sibylla. She is connected to ruling circles in Simulacrum, and was the only survivor of the destruction of Chor Dextra after that choir attempted to perform the Emerald Ri Majon. She joins Chor Tempest at Guragief's request, to try to sort out Limone and the rest of the choir. She has mysterious political connections to a faction within the Simulacran administration. Spoiler it is hinted that Dominura is actually Onashia.In Dominura's last scene, while she walks, we can see sparkly gold flakes in the ground, like the ones that Onashia shows Yun. When Onashia dissappears, Yun calls out Dominura's name as she peers into the Spring.