Laws of Nature.

"Come on, Grandma! If I have to be suspicious of even my own family, then who can I trust?" Asher said, letting out a sigh before sitting down on a chair while massaging his forehead to ease the slight pain he was still feeling.

Arianna moved towards him and placed her hand above his head, sending her spiritual sense into his mind to remove the dizziness and nausea he was feeling before speaking with a gentle voice, "Ufufu~ I guess I went too far this time."

Then looking at Rias, who was staring at her with a confused look on her face, Arianna spoke to her, "It doesn't matter if you can read those books or not. No one needs any cultivation techniques to cultivate the Emperor Realm as long as they have a strong comprehension ability and can sense Laws."

"Laws?" Rias asked her in a confused voice.

"Grandma means the Laws of Nature," Asher answered her question as he looked at his grandmother. "Right?"