Koschei Yaga
Great Dragon of Nature
Koschei Yaga is the Great Dragon of Nature, one of GenoKratos’s children. Once playful and life-giving, she became trapped in decay; Terrane rejected her, while GenoKratos carved a companion named Arianne Vivaldi to ease her loneliness. Koschei uses red, vein-like strings to control bodies and calls the Hero her kin, though the Hero rejects that claim. She tries to make them her puppet, and Baoyu wonders whether loneliness drives her fixation. Miko banishes her through a portal, but Koschei promises to return. She says she was to start a war in exchange for the Hero’s identity, leaving her patron unnamed.
Sources
AQW Wiki: Aria's Quests · AQW Wiki: Ai No Mikoto's Quests · AQW Wiki: Baoyu Lin's Quests · Koschei’s attack · The Yokai Realm confrontation · Arianne Vivaldi