A Record of a Mortal is Journey to Immortality Wiki
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There are three treasures among the Netherworld Race—the Demonic Spirit Drum of the Endless Sky, the Tripartite Origin Bone Flute, and the Sky-Obstructing White Bone Flag. They were crafted from the bones of three true spirits at the Supreme Unity Jade Immortal Realm, and they are collectively known as the 'Three Bone Treasures'. They are extremely useful.

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