The Geotomic Rock Monster is a type of monster from the Ninjago: Masters of Spinjitzu series, inhabiting the sunken library of Hono Mizu.
Background[]
Several of them served among the various hazards guarding the Reversal Time Blade, and were faced by Kai and Nya when they sought to retrieve it. The two ninja were able to defeat them by combining their powers of Fire and Water, which caused the bodies of the monsters to shatter; they subsequently reformed, but much smaller in stature. Terrified by the Ninja who now towered over them, they fled.