Sword drawn, I'm Dragon slayer

Dragon-slayer Sable, born with forbidden Twin Moon Blood, is kept from the Sword in the Stone by her father. When dragon Shivana awakens, Sable trains under exiled prince Lawrence, reforges the sword Frostbite, and learns the dragon princess once sacrificed herself to seal the Dragon King. She and Shivana become allies, slay the Dragon King, and reforge the seal. Afterward, she founds a school for orphans, turning dragon-slayers into protectors.