Deathbringer

Born with the ability to speak with the dead, Viola hates her magic. It killed her sister, Olivia, and if she doesn't learn why, it will kill her too. Her only hope lies within the perilous walls of Gorhail Institute of Magic, where Olivia spent her final days. There, Viola clashes with Sylas, a poison mage whose magic stems from three magical snakes. Immortal, tormented and reckless, Sylas is tethered to a life he never asked for and haunted by guilt for his fathers death.