Multiattack. The terra stomper 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: +10 to hit, reach 10 ft., one target. Hit:33 (4d12 + 7) piercing damage. If the target is a Medium or smaller creature, it is grappled (escape DC 17). Until this grapple ends, the target is restrained, and the terra stomper can't bite another target.
Tail. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit:20 (3d8 + 7) bludgeoning damage.
Terra stompers are six-legged behemoths that can grow as large as the trees in the Vastwood of Tazeem. (Use the tyrannosaurus rex statistics for these fierce beasts.)