“Leg-snapper”, “Sturgeon Shark”, the tank of the coastal waters and rivers
Description
The rockjaw is a heavy, armor-plated predatory fish the size of a sturgeon. It’s quite similar to the Dunkleosteus in both build and function, snapping its jaw in under 20ms, so fast that it generates a pressure vortex in its mouth, sucking prey in before ripping them apart.
Unlike the Dunkleosteus, the rockjaw actually has teeth, teeth that are arranged in a way to form a tight seal when closed, acting like individual scissor blades instead of a big guillotine. These teeth are reinforced with a metal-like mineral at the edges, with a gyroid pattern on the inside, rivaling the hardness of steel. Because of this mineral, some people use their teeth as makeshift daggers.
Behaviour
The rockjaw patrols slowly through riverbeds and estuaries, looking up toward the surface where unsuspecting prey swim (especially turtle-shaped prey). If it spots a turtle or fish above, it will propel itself and strike from underneath like a shark. Otherwise, the rockjaw wades through the riverbeds looking for clams to snatch up and crush, as well as the unfortunate crab or two.
A defining feature of the rockjaw is its two jutting ear-like spines at the end of its head, which it uses during the mating season to ram into other rockjaws.
Diet
The rockjaw uses its immensely powerful jaw to crush river clams, hard-shelled crustaceans, bottom fish, and even turtles. If you’re unfortunate enough to experience its bite, you’d be lucky to walk away with your foot intact, as there are many reports of them shearing legs clean off the bone.
Misc
The meat of the rockjaw is immensely lean and meaty, similar in texture to wild game. This is due to the immense musculature they need to propel themselves through the water at their tanky weight.
- Lifespan: 65-95 years
- Population: 920,000
- Length: 1.8-2.5 m
- Weight: 150-400 kg
- Bite Force: 8-11kN/100-140 MPa (shearing edge)
The World Stones 