For example, when meeting the Tomb King, Nikcat would show respect by replacing most of his own bones with ancient bones.
It was such a symbolically significant bone that Nikcat used it as a vessel for the power of contamination from the Blood Sun Seal.
Nikcat wouldn't be so foolish as to use the ancient bones to desecrate the Tomb King.
There's only one answer then.
Nikcat's cooperation with the Blood Sun Seal was inspired by the Tomb King, so he used the ancient bones to witness this cooperation and to contain the power of contamination.
However, the awkward thing is...
When Noland Lee got rid of Nikcat, he used too much force, giving him a lightning bath and turning him into ashes in one go.
The ancient bone that could prove the secret collusion between the Tomb King and the Blood Sun Seal has been reduced to fragments and powder, making it difficult to serve as strong evidence.
Comini took the remaining remnants of the ancient bone from Noland Lee.
