Stegosaurus (5e Creature)
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Warning, this monster needs re-balancing. Compare it to the 5e hill giant (cr5) which is a similar size category and CR.
Huge beast, unaligned
Senses passive perception 10
Tail. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 14 (3d6 + 4) bludgeoning damage and 7 (1d6 + 4) piercing damage. If the target is a creature, it must succeed on a DC 14 strength saving throw or be knocked prone.
stamp creatures with in a 20 ft radious must succeed on a DC 13 charisma save or flee in terror.They also must succeed on a DC 10 strength save or be knocked prone. If the creature its fighting succeeds on the save it now is scared of the Stegosaurus and has disadvantage on attacks until the creature succeeds on a DC 12 charisma.
Stegosaurus (meaning "roof lizard" or "covered lizard") is a genus of armored stegosaurid dinosaur. A large, heavily built, herbivorous quadruped, Stegosaurus had a distinctive and unusual posture, with a heavily rounded back, short forelimbs, head held low to the ground and a stiffened tail held high in the air. Its array of plates and spikes has been the subject of much speculation. The spikes were most likely used for defense, while the plates have also been proposed as a defensive mechanism, as well as having display and thermoregulatory functions. Stegosaurus had a relatively low brain-to-body mass ratio. It had a short neck and small head, meaning it most likely ate low-lying bushes and shrubs.