Web of Lies — Thomas K. Carpenter

Whoever controls the Hundred Halls, controls the world. Aurelia "Aurie" Silverthorne has high hopes for her second year in the Hundred Halls, the world's only magical university, but her expectations are destroyed when she accidentally unleashes a plague of faez-eating thralls and spends week after week getting killed in the Grand Contest. But none of this matters when Aurie learns that the Cabal searches for a powerful magic that will help them get control of the Hundred Halls. If Aurie can't stop them, then passing her classes will be the least of her worries.