Vampire speed, strength, agility, etc.
Various swords, bows, firearms, and explosives.
Käthe is a vampire and a mercenary. She is selfish, and is willing to do whatever necessary to bring misery upon those around her. She enjoys three things: blood, winning, and making those around her miserable. She doesn't care who she works for or with as long as she gets what she wants. She prefers bladed weapons to firearms, as they are "Coward's weapons."
Ludwik is Käthe's older brother. Like her, he is both a vampire and a mercenary. He enjoys blood and victory like his sister, however he wishes to not cause unnecessary damage or misery. When he was younger he fought in GROM as a medic before leaving to work alongside his sister and keep her out of harm's way.