Davis didn't think Nightveil was illiterate. After all, she was not a wild spirit.
She originally belonged to her Dynastic Evernight Phantasm Spirit Tribe in the Grand Beginnings Continent, which was massacred by Light-Attributed Spirits. She had been an outcast ever since until she encountered the Dynastic Evernight Phantasm Spirit Tribe in the First Haven World and rejoined. She even entered the Aurora Cloud Gate until she decided to enter Mingzhi's life because of the debt she owed him for helping her twice.
Although he didn't doubt her ability to learn, he definitely didn't expect her to be taking up studies of intelligence gathering and legalism that he felt it wouldn't be strange if Mingzhi forced her into this.
"Are you sure you want to be studying these scrolls, Nightveil?"
Davis couldn't help but ask as he wanted to make sure Nightveil was willing.