This mod adds in the "big 3" megatheropods of prehistory, the 3 largest carnivorous dinosaurs in several dimensions. Including Giganotosaurus, Spinosaurus, and Tyrannosaurus. These beasts are extremely powerful, and destroy blocks, making them very hard to contain (nigh impossible, even). They are also aggressive mobs, each with some special gimicks. However, these mobs do rest after killing entities.
The mobs spawn in facility structures that spawn extremely rarely, if the player encounters one,try leaving the area immediately.
Spinosaurus/Tyrannosaurus: 460 health, 45 damage
Giganotosaurus: 510 health, 25 damage