Ten Thousand Year Soul Bone

Ten Thousand Year Soul Bones are high-grade cultivation treasures whose absorption can greatly strengthen a Soul Master. One recorded absorption directly raised its recipient to Rank 89. 76
Soul-bone quality is not determined by age alone: Xue Xing's gemstone-type Ten Thousand Year Soul Bone was said to possess an aura no weaker than that of a Fifty Thousand Year Soul Bone. 84
Soul bones are exceptionally rare. The chance of a soul beast dropping one is described as roughly one in ten thousand; many Titled Douluo never obtain a suitable high-level bone. 120
Compatibility remains a major consideration. Bibi Dong declined a Fifty Thousand Year Evil Eye White Tiger Right Arm Bone because it did not suit her, while Gu Han reserved his non-skull-bone slots primarily for ice-attribute bones. 120
Bones may be retained rather than immediately absorbed when a better match could be obtained later. 120

Known Examples

Soul Bone	Cultivation Age	Type	Known Holder / Disposition	Notes
Gemstone-type Soul Bone	Ten Thousand Year	Unspecified	Presented by Xue Xing to Ning Fengzhi	Its aura was comparable to that of a Fifty Thousand Year Soul Bone. 84
Evil Eye White Tiger Right Arm Bone	Fifty Thousand Year	Right arm bone	Obtained and stored by Bibi Dong	Bibi Dong considered it unsuitable for herself; Gu Han also declined it. 120
Hurricane Right Leg Bone	Thirty Thousand Year	Right leg bone	Tournament reward	One of three high-level Ten Thousand Year Soul Bones offered as Continental Elite Soul Master Tournament prizes. 429
Spirit Skull Bone	Thirty Thousand Year	Skull bone	Tournament reward	One of the three tournament prizes. 429
Evil Eye White Tiger Right Arm Bone	Fifty Thousand Year	Right arm bone	Awarded to Xie Yue	Gu Nanfeng selected Xie Yue as its recipient because of his power-attack weapon martial soul and contribution to the team. 522

Traditionally, Soul Bones could drop from slain soul beasts, though even a Fifty Thousand Year soul beast producing one was treated as an extraordinary stroke of luck. 120
High-value bones are often distributed according to martial-soul compatibility, combat role, and the recipient's future cultivation path. 120 522
After the Spirit Beast Realm became independent, Spirit Bones could no longer be obtained through hunting; they could only be collected by the Heavenly Court from spirit beasts that died naturally. 522
This change made Spirit Bones even more precious across the continent. 522