Actions

Multiattack .
The tyrannosaurus 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 tyrannosaurus can't bite another target.
Tail .
Melee Weapon Attack : +10 to hit, reach 10 ft., one target.
Hit : 20
(3d8 + 7) bludgeoning damage.