Bloodlines.
They were the backbone of human abilities, passed down through generations like some kind of sacred inheritance.
Over time, these abilities became tied to specific lineages, forming distinct families with unique powers. In the human domain, bloodlines were both rare and precious, defining the strength and identity of those who possessed them. Anyone with a bloodline often had at least decent talent.
Unlike arts, which could be learned through training and practice, bloodlines were inherent. They were intricately tied to an individual's mana signature, as if woven into their very being. Without a reference sample of mana from someone who already possessed the bloodline, it was impossible to replicate.
This knowledge, however, wasn't widely known.
Even Atticus had only recently uncovered the truth about this while studying the techniques of different races. But Blackgate already knew. He had always known.