Tyrannosaurus Rex
Huge beast, unaligned
Armor Class 13 (natural armor)
Hit Points 136 (13d12 + 52)
Speed 50 ft., swim 25 ft., climb 25 ft.
str
25 (+7)
dex
10 (+0)
con
19 (+4)
int
2 (-4)
wis
12 (+1)
cha
9 (-1)
Saving Throws Str +10, Wis +4
Skills Perception +4
Senses passive Perception 14
Languages -
Challenge 8 (3,900 XP)
Actions
Bite. Melee Attack Roll: +10, reach 10 ft. 33 (4d12 + 7) Piercing damage. If the target is a Large or smaller creature, it has the Grappled condition (escape DC 17). While Grappled, the target has the Restrained condition and can't be targeted by the tyrannosaurus's Tail.
Multiattack. The tyrannosaurus makes one Bite attack and one Tail attack.
Tail. Melee Attack Roll: +10, reach 15 ft. 25 (4d8 + 7) Bludgeoning damage. If the target is a Huge or smaller creature, it has the Prone condition.