C399 Harry Potter and the Realm Gate?

After Chen Ling got his hands on the time converter in Harry Potter, the reason he didn't use it was simple...

It was too troublesome to use it.

He rotated the hourglass ornament once and returned to an hour ago.

Using this as a base, he calculated the history of Asterisk...

Not long ago, the twenty-fifth batch of Phoenix Star Martial Sacrifice had just ended