Blood Punisher Force
"By the way, miss Fiona, how were you able to track Agatha to the city of White Raven?"
Eren couldn't help asking Fiona as she waited for the city staff to fetch a colt for her. The evening sky had finally turned dark after the sun had disappeared into the horizon.
"Oh! Using this array disk. This artifact is specially created for half-bloods like us. It uses one's bloodline energy to track the person.
It could also be used to track the child of parents who were half-bloods. I had found the residual mana signatures of Agatha's parents from her previous home in the Southern duchy."
Fiona produced a saucer-like artifact with various runes on it. It featured a clock-like levitating hand that was still pointing in the direction of Eren's city. Eren realized how the half-blood was able to track and rescue other half-bloods.
As Eren held the disk in his hands, he coated it in mana before responding.