Christopher came to Florence's residence a few days after Luna's group left Circinus Kingdom.
"To use my ability?" Florence asked.
"Yes. We can find more precious ores in the mysterious mountain range with your ability."
Since it was the mysterious mountain range, it is possible that there are more things that could be found or uncovered. After hearing from Luna that the ore she brought back was actually from the mountain range, he thought there was a chance they would find rarer ores around it.
Then, after doing some research, he came up with the idea of having Florence listen to the echo or allow her mana to travel with her voice.
"Aren't there others?" Florence asked.
"There are. But your voice is different from theirs. Most of the sound ability users use it as a way of attack or defense. Have you ever seen anyone using it to sing?" Christopher asked back in a matter-of-fact tone.
