A Record of a Mortal is Journey to Immortality Wiki
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The Phosphor Bone Flame was a green fire, a wisp of Extraordinary Flames of Heaven and Earth that could only be produced under extremely stringent and special circumstances. It was an extremely rare flame, and it could only be found in bone fragments that were specifically made from the bones of high-tier Demonic Beasts. While its power would be astonishing if it were to be used, it would still be very difficult to retrieve

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