Nightschool vol 2 by Svetlana Chmakova

Alex continues her search for her sister, and only a select few people can remember her.  She gets help from a few other students who decide to recreate the gate spell, but this will be painstaking and take a lot of effort.  Meanwhile, Teacher ferrets out the one who betrayed the hunters, and he moves his group into a safe house with Mr. Roi, the eccentric teacher who has also been giving extra lessons to Alex.  We also learn about Nereshai, an ancient race of extremely powerful magic users, and the Sohrem, a group of powerful magical beings who have begun searching for new hosts within the school building.  Centuries ago, the Nereshai sealed the Sohrem, but that seal has been broken, and it's up to the students and teachers to put everything right and bring home those who have been forgotten.

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