This promise ensures that one can always have the upper hand over the other.
"Yes, it's called the Blood Contract."
The Golden-winged Roc responded decisively, without any hesitation.
The human before it was very powerful, a strength that commanded respect; although it felt reluctant, it had no choice.
At that moment, it spat out a bit of its essence blood, forming a special pattern in the air, resembling its own image.
"Once the Blood Contract is signed, I become your servant, and only you can dissolve it." The Golden-winged Roc explained the function.
In short,
It's equivalent to placing one's life in someone else's hands.
This is very undesirable, but in fact, even without signing it, the situation wouldn't be much different.
Lu Yuan was very satisfied, the counterpart was indeed very smart, not resisting at key moments; truly, exotic beasts are humanity's great enemies.
