It was the power of Anthuor, in his role as Sustainer, which Morbat drew from in procuring the child’s soul in the first place from the Cauldron within the Hypogeum. Delrin thus, was a child of Anthuor, in every way that mattered, and it was evident to all who spoke with her in her delight for the creatures of the wood, and on account of her gentle demeanor.

Source: At the Ruined Altar – Quatrian Folkways – Medium