The Book of Elemental Powers

The Book of Elemental Powers is a Ninjago book that was released on September 7, 2021.
==Summary==
The book has sections on the various elemental powers, including the Elemental Masters who wield them and various creatures associated with them. Interesting details include:
*The confirmation that the Pyro Vipers were originally Hypnobrai.
*The book indicates that Spinjitzu Burst can be performed by any Elemental Master, but that the Masters of Earth have long been the only ones who knew how to use the technique.
*The conflict between Wojira and the alliance of The First Spinjitzu Master, the Merlopians, and the ancestors of The Keepers is referred to as "the Battle of Nine Days."