This enormous beast has rocky, armored plates on its body. Elaborate horns crown its horrific head.
Thunder Behemoth CR 18
N Colossal magical beast (behemoth, earth)
Init –2; Senses blindsense 60 ft., darkvision 60 ft., tremorsense 60 ft.; Perception +27
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
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.
Spell-Like Abilities (CL 20th; concentration +22)
3/day—earthquake (DC 20)
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)
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)
Environment any land
Organization solitary or pair
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).
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.