Frostblood Saga Series by Elly Blake

Seventeen-year-old Ruby is a Fireblood who has concealed her powers of heat and flame from the cruel Frostblood ruling class her entire life. But when her mother is killed trying to protect her, and rebel Frostbloods demand her help to overthrow their bloodthirsty king, she agrees to come out of hiding, desperate to have her revenge... moreSeventeen-year-old Ruby is a Fireblood who has concealed her powers of heat and flame from the cruel Frostblood ruling class her entire life. But when her mother is killed trying to protect her, and rebel Frostbloods demand her help to overthrow their bloodthirsty king, she agrees to come out of hiding, desperate to have her revenge.Despite her unpredictable abilities, Ruby trains with the rebels and the infuriating - yet irresistible - Arcus, who seems to think of her as nothing more than a weapon. But before they can take action, Ruby is captured and forced to compete in the king’s tournaments that pit Fireblood prisoners against Frostblood champions. Now she has only one chance to destroy the maniacal ruler who has taken everything from her - and from the icy young man she has come to love. less

All hail the Fire Queen.Against all odds, Ruby has defeated the villainous Frost King and melted his throne of ice. But the bloodthirsty Minax that was trapped inside is now haunting her kingdom and everyone she loves... moreAll hail the Fire Queen.Against all odds, Ruby has defeated the villainous Frost King and melted his throne of ice. But the bloodthirsty Minax that was trapped inside is now haunting her kingdom and everyone she loves. The answers to its demise may lie to the south in Sudesia, the land of the Firebloods, and a country that holds the secrets to Ruby’s powers and past…Despite warnings from her beloved Arcus, Ruby accompanies a roguish Fireblood named Kai to Sudesia, where she must master her control of fire in a series of trials to gain the trust of the suspicious Fire Queen. Only then can she hope to access the knowledge that could defeat the rampaging Minax—which grows closer every moment. But as sparks fly in her moments alone with Kai, Ruby no longer knows whom to trust. The fates of two kingdoms are now in her hands. less

Ruby's world has changed more than she ever could have imagined. She's in love with a powerful Frost King. She's the heir to the Fire Throne. And she may be a Nightblood--the spawn of a vengeful deity hellbent on releasing his wraithlike Minax from their prison. Once freed, these beasts will roam the earth, devouring every last person until he or she is nothing but an empty husk... moreRuby's world has changed more than she ever could have imagined. She's in love with a powerful Frost King. She's the heir to the Fire Throne. And she may be a Nightblood--the spawn of a vengeful deity hellbent on releasing his wraithlike Minax from their prison. Once freed, these beasts will roam the earth, devouring every last person until he or she is nothing but an empty husk. But Ruby is able to control the Minax to a degree, and now she, her beloved Arcus, and her friend Kai must find a way to bring Frostbloods and Firebloods--sworn enemies--together to make a stand against a foe more deadly than any they've faced.In this heart-pounding finale of Elly Blake's gorgeously written and action-packed Frostblood Saga, the fate of Frostbloods, Firebloods, and all of humanity is at stake. less