Before everyone's eyes, faint voices truly appeared in the room. They were so weak that one had to listen with complete concentration to hear them.
There were also footsteps, the clamor of the surrounding environment—everything sounded as though it were taking place inside a natural cave.
"The music is being played by some kind of stringed instrument," Guilliman said with certainty.
"Yes, my lord. We believe it is a psaltery."
"Judging by its pitch and timbre, it has an especially sharp, high resonance. According to our database analysis, they may be psalteries with larger soundboxes."
A mournful sound slowly rose, its shrill notes stirring sorrow in their hearts.
Guilliman searched his memories for information on psalteries. His mind was more powerful than any database.
"I detected traces of quantum resonance. Unknown fluctuations appeared wherever those spectral phantoms manifested." Lox had obtained useful information from the detection devices he had deployed.
"Then this should have nothing to do with psychic power," Guilliman said.
"I cannot decipher this quantum resonance. It possesses an innate secrecy; the moment I try to observe it by force, it collapses. But I can be certain that something is trying to use quantum resonance to contact you."
Lox withdrew his wrist device. The nanobots returned to his wrist, and it was as if nothing had happened.
The ghosts had appeared only briefly. After roughly thirty seconds, everything vanished.
The group remained in the room, staring at the place where the ghosts had appeared.
"Looks like we won't find an answer this time. Let's take a break." Guilliman was trying to ease the atmosphere. Once he had confirmed that psychic power was not at work, he relaxed considerably as well.
After all, in his mind, those most skilled at wielding psychic power were his traitorous brothers. They worshipped