Winter is gradually enveloping the Castlecotts Estate. The crack on the Sacred Aquamarine magically gradually tightens, and the students continue their studies. It looks like the danger is over. But then why do the strangeness in the castle continue? Why did the order invite the Guardians of Primordial Chaos to Castlecotz, and what are they looking for? In addition, rumors began to spread that the Foggy Sea had begun to move and was engulfing village after village.As if all the frightening external events weren't enough, the Coven, his friends and other Castlecotz students will soon have to find out who Cernunnus is and pass the next most difficult test. Who is he? After all, there is not a word about him in any book in the oldest library in Castlecotts! Friends will have to penetrate a new mystery and delve into self-discovery and struggle with their own fears and doubts.