How the Honorable Knight became the Cruel Villainess

To save the Kingdom of Astahari, the Sword of Marmorra would do anything. Even if it was to play the villain of the story. (If during her journey she bags a prince, power, a dragon, and many beautiful lovers... Well, those must be just blessings from the Spirits, of course.) Aditional tags: Bisexual MC, polyamory endgame. Enemies to friends to lovers. Friends to enemies. Betrayal. Beast Taming. Genre swap.