Hit Dice: 18d8+99 (180 hp)
Speed: 40 ft. (8 squares)
Armor Class: 14 (–2 size, +1 Dex, +5 natural) touch 9, flat-footed 13
Base Attack/Grapple: +13/+30
Attack: Bite +20 melee (3d6+13)
Full Attack: Bite +20 melee (3d6+13)
Space/Reach: 15 ft./10 ft.
Special Attacks: Improved grab, swallow whole
Special Qualities: Low-light vision, scent
Saves: Fort +16, Ref +12, Will +8
Abilities: Str 28, Dex 12, Con 21, Int 2, Wis 15, Cha 10
Skills: Hide –2, Listen +14, Spot +14
Feats: Alertness, Improved Natural Attack (bite), Run, Toughness (3), Track
Environment: Warm plains
Organization: Solitary or pair
Challenge Rating: 8
Alignment: Always neutral
Advancement: 19–36 HD (Huge); 37–54 HD (Gargantuan)
Level Adjustment: —
This towering predator has an enormous head and a mouth full of dagger-sized teeth. It stands on two powerful legs and has only vestigial forelimbs. This ravenous creature is the most fearsome of all carnivorous dinosaurs.
Despite its enormous size and 6-ton weight, a tyrannosaurus is a swift runner. Its head is nearly 6 feet long, and its teeth are from 3 to 6 inches in length. It is slightly more than 30 feet long from nose to tail.
A tyrannosaurus eats almost anything it can sink its teeth into, and spends a great deal of its time scavenging for carrion and chasing smaller carnivores away from their kills.
A tyrannosaurus pursues and eats just about anything it sees. Its tactics are simple—charge in and bite.
Improved Grab (Ex): To use this ability, a tyrannosaurus must hit an opponent of up to one size smaller with its bite attack. It can then attempt to start a grapple as a free action without provoking an attack of opportunity. If it wins the grapple check, it establishes a hold and can try to swallow the foe the following round.
Swallow Whole (Ex): A tyrannosaurus can try to swallow a grabbed opponent of up to two sizes smaller by making a successful grapple check.
The swallowed creature takes 2d8+8 points of bludgeoning damage and 8 points of acid damage per round from the tyrannosaurus’s gizzard. A swallowed creature can cut its way out by using a light slashing or piercing weapon to deal 25 points of damage to the gizzard (AC 12). Once the creature exits, muscular action closes the hole; another swallowed opponent must cut its own way out.
A Huge tyrannosaurus’s gizzard can hold 2 Medium, 8 Small, 32 Tiny, or 128 Diminutive or smaller opponents.
Skills: A tyrannosaurus has a +2 racial bonus on Listen and Spot checks.
Source: Monster Manual