Mammatus
Chief Mammatus is the current leader of the Keepers . Like the rest of the Keepers, Mammatus bore the responsibility granted by the First Spinjitzu Master of protecting the Storm Amulet , an ancient relic and the key to awakening Wojira . Deceived into thinking Wojira had awoken and was preparing to attack, Mammatus and the Keepers attempted to appease the beast, but to no avail. After apprehending the ninja , Mammatus planned to sacrifice Jay to the beast, but helped the ninja after they uncovered Ronin 's falsification of Wojira. Following the battle, Mammatus realized the Storm Amulet was missing, but he and Nya quickly retook it from Clutch Powers . . Sometime later, the ninja face Kalmaar , who schemes to awaken Wojira. They return to Mammatus's island and explain the situation. Mammatus entrusts the ninja with protecting the Storm Amulet, but they quickly realize it's a fake, and the real one is in Clutch Powers' possession. .