The Elementals: Sansul by Natasha Quaresma

"Peaceful centuries pass after the War Against The Angels. On the night of the lavish Samhain Festival, the people of Wilmota have not a care in the world. That is until the lights of Sansul Fortress come to life, and with them, its inhabitants. The Darkness is coming… Thrown into the chaos of a bloody massacre, Adrianna, a young student, tries to escape only to be captured and imprisoned in the fortress. Abandoned by their neighbouring clans, Adrianna and her people must languish as prisoners to them. The Vahir. Stripped of her strength by the Darkness, Adrianna’s only comfort comes in her will to live. With her best friend gone, her parents missing and her clan on its way to organised annihilation, Adrianna forces herself to survive the dangers and deception that surround her every move only to find that everything she once believed was fact is fiction, and folklore is indeed, true. Which version of history should she choose to believe? Adrianna must figure out who her true enemies are, whom she can trust, and which side of two battling factions to help in order to avoid another inter-Plane war."