So it was that Katarina’s childhood—if it can be called such—had little room for kindness or rest. She spent every waking moment honing herself into the ultimate weapon, testing her endurance, her dexterity, her tolerance for pain. She stole poisons from the city’s least reputable apothecaries, testing their efficacy in tiny increments upon herself, gradually building her resistance even as she catalogued their effects. She scaled the tallest towers in the dead of night, unseen by anyone.