For the future

"Seara didn't mention that, but…" Rain said, and then he recalled something.

There were those rich in mana coral stones that Rain had taken from the sea dragon's base… he could use that, but he probably needed to take more from their territory. At the same time, Rain recalled instruments that were made of stone… and probably could be made using corals as well.

Rain recalled ocarinas. Ocarinas were small, egg-shaped wind instruments made of stone. These instruments had a rich history in cultures from Earth, including ancient Mesoamerican and Chinese societies. Ocarinas were often used in rituals, celebrations, and storytelling. 

Some cultures have also crafted flutes and pipes from stone, utilizing their natural acoustic properties. These stone flutes were often used in folk music, storytelling, and rituals. The precision in crafting these instruments was a testament to the skill and artistry of the people who created them.