Although Lilith appears very human in many aspects, as an artificial intelligence, her requirements in certain areas are indeed high.
An eighty percent score wouldn't be considered excellent for the human race, but at least it could be considered good; however, here it's just barely passing.
Referencing Lilith's alchemy results, Zheng Yichen indeed feels ashamed—Lilith didn't rate herself a perfect score, instead giving herself ninety-nine.
The reason for such a score is that there's Dusk pressing above her, and also because she can't be like Dusk and create any potion whatsoever.
During alchemy, Zheng Yichen visited Dusk to ask Tia a question about whether the Dusk nun could create that kind of immortality potion.
It's the kind of immortality potion that left a deep impression on Zheng Yichen but belonged to an 'outdated' game, something that couldn't be killed, even if the body was destroyed, a new one could be generated.
Tia's answer was affirmative...
