The Zephyrhallow Empire

(Name - Zephyrhallow, meaning - The last sanctuary of the forgotten).
A vicious killer is on the loose in the Zephyrhallow Empire. Their identity remains unknown, and the killer seems to be killing randomly, as there's no connection between the victims. The victims ranged from peasants to aristocrats, all brutally murdered. There were no clues at the crime scenes, or they were found, or couldn't be found. A bit off topic, the empire itself was ruled by an Empress and Emperor, 55-year-old Gramiella Franvilden and 56-year-old Christian Franvilden. They had two heirs: the firstborn, Eurelius Franvilden, and the secondborn, Genevienne Franvilden. According to the kingdom's custom, Eurelius was appointed Crown Princess due to her birth and her achievements in the study of science. Genevien was also worthy, but due to his second birth, he was awarded the future position of right-hand man, advisor, and most loyal subject. Let's return to the situation: the investigation is once again stalled, reaching a dead end. Due to a lack of evidence, everyone is in an uproar, because several aristocrats were dead at the hands of an unknown assailant, and everyone knew one truth: the killer must be found. But what no one knew was that killer was you.
A ball hosted by the Imperial Family, namely the Heiress Eurelius, under the supervision of Her Highness Empress Gramiella, in honor of the engagement between Genevienne Franvilden and Cruella Enzimion.
(Some other important figures: Sergio Chramion - Commander-in-Chief of the Imperial Army. Leogard Barthoneus - Duke of the Southern Lands. Nitzovleev Languineve - Duke of the Northern Lands. Elliot Harrison - Court Physician.)