Divinity.
It was proof of the most direct connection to a god.
Pure deities were not Heroic Spirits, so they could not be summoned.
However, those who were not complete deities but had some direct connection to them—such as Heroic Spirits who had inherited part of their bloodline—could be summoned as Servants.
Naturally, barring unforeseen circumstances, Servants of this type were exceedingly powerful.
That was why Fang Li had prepared Aqua's blood as a catalyst.
Come to think of it, the circumstances behind obtaining that blood were rather unbearable to recall.
It happened when Fang Li discovered that any liquid Aqua touched would turn into holy water, capable of dispelling monsters and healing injuries, and marveled at it.
At the time, Aqua immediately got carried away.
"You think I'm just anyone? I'm the greatest Goddess of Water, you know? Isn't making this much holy water only natural? Were you surprised? Really surprised? What a fuss over nothing. This kind of holy water is nothing. Let me tell you, my blood is even more effective. Demons and undead turn to ash the moment they touch it, and no matter how badly someone is hurt, they'll recover immediately as long as they use my blood. Amazing, right? ...Wait, why are you looking at me like that? This Goddess definitely isn't a little scared, okay? Are you planning to do something perverted to me? That would be terribly disrespectful, you know? Don't come closer, seriously, don't come closer. Fine, I was wrong. I apologize, so please don't come closer...! Uwaaaaaah!"
That was how it had happened.
Of course, Fang Li had only taken her blood at the time to get back at Aqua for getting so full of herself.
He had never expected it to be used in this manner.
"I hope it