Tyrannical Song's memories of his numerous deaths were like a key, unlocking the mysteries of the power of the Bone of Immortality.
Death was the only way to decipher the power of the Bone of Immortality, much like fingerprints recorded by a fingerprint lock. In addition, the resurrection method from the Black Dragon World, the "Dragon Talisman Reincarnation" imprint, served as that "fingerprint lock."
Once the two fused, the power of the Bone of Immortality led, followed closely by the rest of the immortality information, circulating within Song Shuhang's body.
The power of the Bone of Immortality became active and split into two parts. One part continued guarding the "mechanical core reactor," while the other ran amok within Song Shuhang's body.
All of the Immortal Information was similarly split into two by the power of the Bone of Immortality.