The blood steeped in the spirituality of the soul for so long naturally produced extraordinary power within the bloodlines of some powerful and mysterious life forms.
In the last era, humans suddenly attempted to consume the flesh and blood of mysterious creatures during a certain period, leading to a reduced lifespan and elimination for many, but a few survivors gave birth to descendants who gradually possessed a minuscule amount of extraordinary power.
Nowadays, humans no longer use the high-risk method of indiscriminately consuming the flesh and blood of mysterious creatures.
Instead, only a select few with an inherent extraordinary bloodline create specific magic potions using the flesh and blood of related mysterious creatures to activate their latent bloodline potential, naming the method of mastering this power the "Knight Bequest."