As Eris trained with Amaterasu, Arad was back with Kali, and she didn't have much to teach him besides raw fighting power and divine magic control. Arad was massive, heavy, strong, fast, and utterly deadly even without the help of skills and techniques.
But the main reason that teaching Arad's techniques was useless was that he could already learn directly from his opponents. There was no need for Kali to try to drill everything into his mind. She stood tall, her bare feet resting on cold golden ground.
This wasn't a training ground, but the sacred temple of destruction. The place where she trained Lucy, the place where her father channelled his power into her, the place where he died, and the beating heart of the abyss.
