C49 Growing Black Flame Crystals

"Grandpa Geral, you know it!" Arles was just asking for a try, but he didn't think that Old Director Geral would really know about it. Furthermore, from the old Headmaster's agitated attitude, Arles was even more certain that this seemingly pitch-black "Black Flame Crystal" was actually what the dirty old shopkeeper said, a crystal mine that was used to forge Godly Weapon of the Fifth Level