William knew the buyers weren't insane to throw away such wealth without having tons of gains in return.
As he reached that place, he decided to do everything he could to find such scrolls. He was curious about what kind of secrets they held and didn't plan to share his finding with Angelica and keep anything he'd find to himself.
The place he ended at was a secluded hall, one that spanned for hundreds of metres with only one entrance towards it. It was a tunnel, twisting right and left, up and down, filled with lots of useless traps.
When he arrived, he found stones in the walls releasing faint light all over the place. He didn't care about any of this and focused over the ceiling and walls.
"Long of time passed, and there are still unhealed cracks all over the place," William examined everything using his spirit sense. And that was why he didn't need light in the first place.