Behemoth, Thunder

This enormous beast has rocky, armored plates on its body. Elaborate horns crown its horrific head.

Thunder Behemoth CR 18

XP 153,600
N Colossal magical beast (behemoth, earth)
Init -2; Senses blindsense 60 ft., darkvision 60 ft., tremorsense 60 ft.; Perception +27

DEFENSE

AC 35, touch 0, flat-footed 35 (-2 Dex, +35 natural, -8 size)
hp 337 (25d10+200); regeneration 20
Fort +22, Ref +12, Will +12
Defensive Abilities unstoppable; DR 15/epic; Immune ability damage, acid, aging, bleed, disease, energy drain, fire, mind-affecting effects, negative levels, paralysis, permanent wounds, petrification, poison, polymorph; SR 29
Weaknesses vulnerable to miracles and wishes

OFFENSE

Speed 30 ft., burrow 30 ft.
Melee bite +33 (4d6+16 plus grab), gore +33 (4d6+16), 2 stomps +28 (2d8+8 plus trip)
Ranged 4 rocks +15 (3d6+24 plus stun)
Space 30 ft.; Reach 20 ft.
Special Attacks fast swallow, mighty roar, rock spitting, ruinous, swallow whole (4d6+24 bludgeoning and 4d6 fire damage, AC 27, 33 hp), trample (2d8+24, DC 38)
Spell-Like Abilities (CL 20th; concentration +22)

3/day—earthquake (DC 20)

STATISTICS

Str 43, Dex 6, Con 26, Int 3, Wis 14, Cha 15
Base Atk +25; CMB +49 (+53 grapple); CMD 57 (61 vs. trip)
Feats Awesome Blow, Cleave, Great Cleave, Greater Bull Rush, Greater Overrun, Greater Sunder, Improved Bull Rush, Improved Overrun, Improved Sunder, Iron Will, Lunge, Power Attack, Snatch
Skills* Perception +27, Survival +14, Swim +28; Racial Modifiers +10 Perception
Language Aklo (cannot speak)

SPECIAL ABILITIES

Mighty Roar (Su)

Every 1d4 rounds as a standard action, a thunder behemoth can issue a mighty roar in a 60-foot cone that duplicates the effect of an empowered greater shout (Fortitude DC 30 for half damage). This is a sonic effect. The save DC is Constitution-based.

Rock Spitting (Ex)

A thunder behemoth can spit rocks from the essentially inexhaustible store in its gizzard. It can spit up to four rocks as a standard action, with a range increment of 60 feet. A creature that is critically hit by one of these rocks must make a DC 38 Fortitude save to resist being stunned for 1 round. The save DC is Strength-based.

Swallow Whole (Ex)

A thunder behemoth has five stomachs and can shunt a swallowed victim into any one of them (usually choosing an empty stomach).

ECOLOGY

Environment any land
Organization solitary or pair
Treasure none

Thunder behemoths walk the land as little more than roving appetites, driven by an all-consuming hunger to devour every animal, plant, and even building in sight. They indiscriminately gorge their five seemingly bottomless stomachs on forests and jungles, collapse mine and mountain alike in search of ore, and raze settlements and strongholds for the cowering morsels within.

Thunder behemoths are sent out by the gods to destroy wicked cities, raze great temples or monuments that offend divine eyes, and otherwise act as instruments of divine wrath either on the surface of a world or just below it. The days before a thunder behemoth arrives are fraught with minor but unnerving earthquakes, mass exoduses of burrowing animals to the surface, and an unexplained increase in fallen trees and sinkholes.

Variant: Behemoth, Thunder, Volcano (CR 17)

[Source]

Through the black ash and smoke, you make out an enormous beast that looks like it has an exploding volcano on its back, its entire body is covered with obsidian and basalt armored plates.

Lava Burn (Ex)

A volcano behemoth’s melee attacks deal 2d6 fire damage in addition to damage dealt. Those affected by the lava burn ability must also succeed on a Reflex save (DC 30) or catch fire, taking 2d6 for an additional 1d4 rounds at the start of its turn. A burning creature can attempt a new save as a full-round action.

Dropping and rolling on the ground grants a +4 bonus on this save. Creatures that hit a volcano behemoth with natural weapons or unarmed attacks take fire damage as though hit by the volcano behemoth and must make a Volcano Behemoth Reflex save to avoid catching on fire. If a volcano behemoth is hit with a melee weapon that weapon takes fire damage as though hit by the volcano behemoth and must make a Reflex save (DC 30) to avoid catching on fire. This effect does not avoid or ignore hardness.

Weapons that deal additional cold or fire damage are immune to this effect (such as a flaming or icy burst weapon). The save DC is Constitution-based.

This replaces a thunder behemoth’s grab, fast swallow, and swallow whole special attacks.

Pyroclastic Aura (Ex)

A volcano behemoth exudes a smoky, poisonous gas in a 30ft. radius.

Pyroclastic aura—inhaled; save: Fort DC 30; frequency: 1/round for 10 rounds; effect: 1d6 Constitution damage; cure: 2 consecutive saves. The save DC is Constitution-based.

The smoke obscures all sight, including darkvision, beyond 5 ft. A creature within 5 ft. has concealment (attacks have a 20% miss chance). Creatures farther away have total concealment (50% miss chance, and the attacker can’t use sight to locate the target). A moderate wind (11+ mph) disperses the smoke in 4 rounds; a strong wind (21+ mph) disperses the smoke in 1 round, but the smoke returns after 1d4+1 rounds.

This replaces a thunder behemoth’s rock spitting special attack.

Breath Weapon (Su)

Once every 1d4 rounds as a standard action, a volcano behemoth can expel a 60 ft. cone that deals 12d6 points of fire damage and 12d6 points of magical bludgeoning damage. A successful Reflex save (DC 30) results in half damage. Creatures with damage reduction that is not overcome by magical bludgeoning damage apply their listed damage reduction amount per die of magical bludgeoning damage. In addition, the cone of gas is poisonous.

Breath Weapon

Form: injury; save: Fort DC 30; frequency: 1/round for 10 rounds; effect: 1d6 Constitution damage; cure: 2 consecutive saves. The save DC is Constitution-based.

This replaces a thunder behemoth’s mighty roar special attack.