Tarrasque (CR 20)

Colossal Magical Beast
Alignment: Always neutral
Initiative: +7 (+3 Dex, +4 Improved Initiative); Senses: scent, Listen +17, and Spot +17

AC: 35 (-8 size, +3 Dex, +30 natural), touch 5, flat-footed 32
Hit Dice: 48d10+594 (858 hp); DR: 15/epic
Fort +38, Ref +29, Will +20
Speed: 20 ft.
Space: 30 ft./20 ft.
Base Attack +48; Grapple +81
Attack: Bite +57 melee
Full Attack: Bite +57 melee and 2 horns +52 melee and 2 claws +52 melee and tail slap +52 melee
Damage: Bite 4d8+17/18-20/x3, horn 1d10+8, claw 1d12+8, tail slap 3d8+8
Special Attacks/Actions: Augmented critical, Frightful presence, rush, improved grab, swallow whole
Abilities: Str 45, Dex 16, Con 35, Int 3, Wis 14, Cha 14
Special Qualities: Carapace, immunity to fire, poison, energy drain and ability damage, regeneration 40, SR 32
Feats: Alertness; Awesome Blow; Blind-fight; Cleave; Combat Reflexes; Dodge; Great Cleave; Improved Initiative; Iron Will; Power Attack; Toughness (6)
Skills: Listen +17, Search +9, Spot +17, and Survival +14 (+16 following tracks)
Advancement: 49+ HD (Colossal)
Climate/Terrain: Any land and underground
Organization: Solitary
Treasure/Possessions: None

Source: Monster Manual

Frightful Presence (Su): The tarrasque can inspire terror by charging or attacking. Affected creatures must succeed it a Will save (DC 26) or become shaken, remaining shaken until they leave the area of effect.

Rush (Ex): Once per minute, the normally slow-moving tarrasque can move at a speed of 150 feet.

Improved Grab (Ex): To use this ability, the tarrasque must hit a Huge or smaller opponent with its bite attack. If it gets a hold, it can try to swallow the foe.

Swallow Whole (Ex): The tarrasque can try to swallow a grabbed opponent of Huge or smaller size by making a successful grapple check. Once inside, the opponent takes 2d8+8 points of crushing damage plus 2d8+6 points of acid damage per round from the tarrasque's digestive juices. A swallowed creature can cut its way out by dealing 50 points of damage to the tarrasque's digestive tract (AC 20). Once the creature exits, muscular action closes the hole; another swallowed opponent must cut its own way out.

The tarrasque's gullet can hold two Huge, four Large, eight Medium-size, or sixteen Small or smaller creatures.

Augmented Criticals (Ex): The tarrasque threatens a critical hit on a natural attack roll of 18-20, dealing triple damage on a successful critical hit.

Carapace (Ex): The tarrasque's armor-like carapace is exceptionally tough and highly reflective, deflecting all rays, lines, cones, and even magic missile spells. There is a 30% chance of reflecting any such effect back at the caster, otherwise, it is merely negated. Check for reflection before rolling to overcome the creature's spell resistance.

Immunities (Ex): The tarrasque has fire, poison and disease immunity.

Regeneration (Ex): No form of attack deals normal damage to the tarrasque. The tarrasque regenerates even if disintegrated or slain with death magic: These attack forms merely reduce it to -10 hit points. It is immune to effects that produce incurable or bleeding wounds, such as a sword of wounding, mummy rot, or a clay golem's wound ability. The tarrasque can be permanently slain only by reducing it to -30 hit points and using a wish or miracle spell to keep it dead.

If the tarrasque loses a limb or body part, the lost portion regrows in 1d6 minutes (the detached piece dies and decays normally). The creature can reattach the severed member instantly by holding it to the stump.

Skills: The tarrasque receives a +8 racial bonus to Listen and Spot checks.

The tarrasque attacks with its claws, teeth, horns, and tail.