Song of Fire location (Vesper, the Cursed Land)

Clue

"How can you just use this as a mere bed? Can't you see its value?" he exclaimed in disbelief. "It's large and sturdy... Yes, it's hard, but better than the floor, right? What's the big problem? Ugh..." "What's the big problem? To treat something so valuable with such disregard!" "If it's so important, get me something to eat first, then take it away. It's not even edible, just heavy, so why bother with it? Sheesh." "I was just getting to that. I couldn't just leave it, not after I've seen it." The armed knight of Vern then quickly instructed his men to carry the bed away. "Leave the pillows and blankets. No use in gathering such tatters. The rock is all that matters. Hurry up. We're shipping them to Vern by boat. Get it to the dock swiftly. This is too important a discovery to be lost in the upcoming war. I need to write to the professor immediately."

Story

The blazing fire gradually subsided and disappeared. The relics they left behind continue to sing. People have been approaching, saying they hear the music. Beyond the giant flames and boiling lava, if there is sand and ash, the Haals are there. Wherever that is.