Leaving Therisa for her training, Arad headed back to the abyss as Kali herself returned to where he was training with the archons. She had inspected his nymph's body and power, and found that while he had the potential to become as big a monster as Amaterasu, he was still far away from that. AO himself can fully utilize that body, while Arad still can't and would need centuries to marinate and sink deeper into the nymph's power.
It wasn't something that could be trained or forced, and only time, experience, and getting used to that body would allow him to approach its peak potential.
