What happened to his enemy?
Henry found no information about that. Instead, he learned that his disciples helped build the Library Tower.
He wasn't sure if all of them helped or, more accurately, if all of them were alive at that time. The possibility caused Henry's heart to skip a beat.
He quickly calmed down as he remembered he was already far into the future. Whatever happened back then didn't matter anymore.
It was critical for him to understand the truth early on. That way, he would have time to make preparations.
Everything became clear to Henry. There were no enemies left before the library was built. He was 99% confident that they had won.
The 1% was because Henry died. He wasn't sure how he could die, yet they still won. It kept him from readily accepting the history written by the library.
Either way, he needed to get to the 100th level. All of the answers were there.