A Villainess for the Tyrant Vol. 3 - A Villainess for the Tyrant, #3

An irrepressible bloodlust. A hidden library. A world on the brink of ruin. Estian had kept his bloodlust on a tight leash since Cecile came into his life. Lately, it had been getting increasingly harder to ignore and now demanded satiation. The conquest of the Etia Dukedom was supposed to be a convenient outlet for his madness. However, was that all it was or has the emperor been dancing to the duke's tune the whole time? Back at the palace, Cecile falls into a magic portal and is transported into a mysterious library.
Shelves upon shelves brimming with books cover the walls. Their contents leave the empress baffled: every last one features tales of herself and her tyrannical husband. Fantastical truths are revealed, some of which Cecile finds hard to believe. Her contemplation of them grinds to a halt when, upon stepping foot outside, her memories are erased. Amidst the confusion, the crown prince of the Hyun continent makes an appearance.
Why is he eying the empress, and what is all this talk about the infamous villainous empress being destined to save the world? Among these scheming walls, only the wicked can survive.