He returned to his room.
Ye Lin laid the Book of Questions and Answers flat on the desk and considered how to use it.
The scenario containing the keepsake would require two questions: what was the strongest being in that scenario, and what keepsake had the letter's owner left behind?
The former would let him estimate the scenario's difficulty, while the latter would help him judge the keepsake's value.
So, to maximize his gains, he could spend only one question on finding out exactly who was in the grave.
After a long while, once he had settled on his question, Ye Lin slowly pressed his hand against the cover of the Book of Questions and Answers.
According to the system's description, the Book of Questions and Answers could answer questions related to whatever was placed on it. He therefore planned to exploit a loophole, using his hand as the "object" to ask a question about the real world.
He wasn't sure whether it would work, but it was worth a try.
In the darkness, Ye Lin sat upright at the desk as though performing some kind of ritual. As his palm settled on the book, the entire volume began to glow a faint red.
Taking a deep breath, Ye Lin enunciated each word:
"I want to ask..."
"Who exactly was buried in the last grave I entered?"
As his words faded, Ye Lin stared fixedly at the parchment book on the desk.
He waited anxiously. Suddenly, the parchment-bound Book of Questions and Answers began shaking violently.
A strange force instantly knocked his hand away. The entire book moved without any wind, as though a pair of enormous, invisible hands were opening it.
Rustle, rustle!
The pages flipped wildly, beams of red light shooting out from between them and flooding the