Penetrating through a tunnel into a half-flooded underground bay, a team of like-minded people finds the ship of the legendary corsair Carrigo. Among the finds are the captain's diary and a chest that belonged to a powerful necromancer who fell victim to his own magic. The mysterious inscription-riddle on the invitation to the Academy leads to the basements of the castle, and new discoveries are not long in coming. But not everyone is happy with their search; Having set off on another expedition, the friends fall into a trap. And only a miracle helps to find a way to salvation. It is not easy to win a battle with an enemy who is much more experienced in magic. Only a mysterious formula from a textbook, long forgotten by someone in room No. 13, brings victory. But there is no turning back for those who use it; they are doomed to meet their own fate.