Fighting station "Prime". Book 4. Spirit in stone. Stevens K.

The first knight Ned returned the enchanted sword for himself, but not without consequences. Zoya took the mysterious red stone from the fortress, and the evil spirit of Hirobrin, sharpened in it, entered into it. To save her, a disease and Brooklyn have to seek help from a witch. Pell, Logan, Maddie and Claud at that time decide to follow the skeletons and go down to the deserted temple in the hope of finding out who is behind the attacks on the Prime combat station.