Harry and his Aurors could do nothing to prevent Scorpius, Dorian, and Dylan from entering Number Twelve Grimmauld Place undisturbed. Albus" friends, those strange yet seemingly innocent children who had once frequented his home, had just killed witches and wizards before his eyes, and he - the Boy Who Lived, an experienced Auror - had failed to stop them. As soon as the door closed behind them, the building was enveloped in an unsettling black mist, within which lightning and sparks flickered. The Children of Salazar had barricaded themselves inside an impenetrable fortress of Dark Magic.