Why a Greater Elf Warrior weapon called the Wailing Cage Sword is so named remains a mystery.
But its value is absolutely enormous, after all, it requires soaking in the blood of a Greater Elf—whether the blood is from an enemy Greater Elf or an elderly one, the value is still expensive.
Beneath the weapons of Greater Elf Warrior rank are Dragon Bone Weapons, weapons made from dragon bones—Liszt highly suspects that the great sword of the Marquis of Bull that spews blue flames is a Dragon Bone Weapon. Coincidentally, the left foreleg of the Sapphire Dragon is broken off, and much of its power has been stolen by the Marquis of Bull.
The clues match.