Vampire Overlord System in the Apocalypse - Chapter 124: Robot Maids?!

... ady considered as members of the Vampire Family after they acquired Blood Core Batteries, enhanced versions of Mana Core Batteries that could self-upgrade themselves, giving various power such as body self-modification, magic material absorption, and even the ability to wield an attribute of magic which they developed into Abilities.

And as they consumed more materials, they grew even stronger.

Noah felt like they were even developing Souls of their own, and that they could perha ...