The Burden we Bear

Adelaide 'Addy' Discentia is heir to the throne. Her father, King Theordoric has spent years bending the kingdom to his will. Keeping the rich, rich, and treating the poor as worthless and expendable, ensuring that they can do nothing but turn to him. By night, and any other time of day she can manage, she casts the striking figure of the kingdom's robin-hood-esque vigilante. Her years of surviving under his rule, in his castle, watching his violence unfold around her, has desensitised her and she now has no issue inflicting pain and suffering on those deserving of it. Disguised as a man with the help of her loyal men, they wreak havoc across his "peaceful" kingdom, one rich noble at a time.
By chance, Adelaide almost kills a demon from another realm, and he offers his services to her cause. With mutilated bodies piling up, strange creatures re-emerging by the day and her father hunting her every step of the way, they must team up with rebel leaders and unlikely characters to fight their way to freedom.
Her father's tyrannical reign must end, and she is determined to be the one to push him off his throne, quite literally if necessary.