Monsoon, the King of Resolve and Speed

It was late at night, but the library, with all of its countless ancient tomes, was still brightly lit. The teachers were all busy and nervous as they flipped through boxes and opened drawers, searching for the oldest texts and then reading through them speedily while taking notes.

A teacher didn't just need formidable combat power, but also a rich store of knowledge and a keen understanding of demons. Thus, the teachers were all white-haired elders.

Besides City Lord Lu Tailai, City Lord Calvinson was also present. Just like how the demons had thirteen Demon Kings, the humans of Subduing Demon City had thirteen City Lords. Calvinson was famous for his knowledge of history, and he had a deep understanding of the demon Bloodlines throughout the ages.

The sky was soon beginning to brighten. The whole night had gone by, and the teachers put the ancient texts back onto their shelves in the deepest depths of the library and left, utterly exhausted.