Mapusaurus (5e Creature)
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Gargantuan beast (theropod), unaligned
Multiattack. The mapusaurus makes two attacks: one with its bite and one with its tail. It can't make both attacks against the same target.
Bite. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 36 (4d12 + 10) piercing damage. If the target is a Large or smaller creature, it is grappled (escape DC 20). Until this grapple ends, the target is restrained, and the mapusaurus can't bite another target.
Tail. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 23 (3d8 + 10) bludgeoning damage.
This apex predator hunts only the largest of sauropods. Using what some experts term the Slow Burn Method, these normally solitary predators gather in groups of 2-4 individuals, and use their long jaws to tear chunks out of their prey and slash the prey and cause massive amounts of bleeding and drain the prey of stamina until it collapses, then they move in and finish the kill. After a successful hunt, the mapusaurus go into a feeding frenzy, snapping at each other until each one eats their fill. Despite this, mapusaurus won't hesitate to go after easier prey, such as humanoids.