Stone Cold

Stone Cold is a Ninjago book that was released in 2013. The seventh volume of the Ninjago graphic novel series, it does not correspond with the plot of LEGO Ninjago: Masters of Spinjitzu.

Description
''The best-selling mega-hit continues as Jay, Cole, Zane, and Kai square off against the evil Stone Warriors! Frustrated and discouraged by their lack of powers and their inability to defeat the Stone Warriors, Jay, Cole, Zane, and Kai learn secrets of Sensei Wu’s past adventures that may hold the key to future victory.''