Mors / Quies
Harbinger of Death
Quies, the youngest of the Celestial siblings, loved the quiet beauty of creeks, sunsets and fireflies. The Bright One transformed her while blaming one sibling for her fate. That sibling says they still hear her voice and glimpse the child they remember. Aranx thinks he sees a smile after Mors, the Harbinger of Death, is defeated.
Sources
AQW Wiki: Four Harbingers · AQW Wiki: Mors · AQW Wiki: Scroll Of The Innocent · Four Harbingers map · Aranx’s quests (AQW Wiki transcript)