Restless Stars (Zodiac Academy, Book 9) by Caroline Peckham

In a realm of orphans, changelings, and royals, destiny hangs on celestial threads amid the shadow of a false king's tyranny. As the kingdom quivers under darkness, the heirs must seize their crowns, fueled by savage determination and elemental power. Their journey through Zodiac Academy, a merciless arena where strength reigns supreme, offers no sanctuary. This dark fantasy romance shuns the comforts of a typical magical school, plunging into a cutthroat world where survival demands ferocity. Here, there's no benevolent headmaster to shield them; instead, a sinister dictator lurks, rivaling Voldemort in malice. Brace for a turbulent saga where stardust swirls with blood, and victory hangs on the edge of each blade. As the Starfall Legion charges into battle, the True Queens must prove their mettle, for their rule hinges on the outcome.

This isn't a tale of camaraderie and camaraderie; it's a ruthless odyssey where power is seized, not given, and where the struggle for dominance ignites like wildfire. So, abandon all notions of whimsy and prepare for a journey where darkness and desire entwine, and where the fate of a kingdom is forged in the crucible of war. All hail the True Queens, for their reign shall be measured in blood and stars, enduring long past the night's end.