Legendary Resistance (3/Day). If the behemoth fails a saving throw, it can choose to succeed instead.
Magic Resistance. The behemoth has advantage on saving throws against spells and other magical effects.
Magic Weapons. The behemoth's weapon attacks are magical.
Siege Weapon. The behemoth does double damage against objects and structures.
Multiattack. The behemoth makes four attacks: one with its bite, two with its claws, and one with its tail.
Bite. Melee Weapon Attack: +19 to hit, reach 15 ft., one target. Hit: 36 (4d12 + 10) piercing damage. If the target is a large or smaller creature, it must succeed on a DC 20 Dexterity saving throw or be swallowed by the behemoth. A swallowed creature is blinded and restrained, it has total cover against attacks and other effects outside the behemoth, and it takes 56 (16d6) acid damage at the start of each of the behemoth's turns.
If the behemoth takes 50 damage or more on a single turn from a creature inside it, the behemoth must succeed on a DC 20 Constitution saving throw at the end of that turn or else it regurgitates all swallowed creatures, who fall prone in a space within 10 feet of the behemoth. If the behemoth dies, swallowed creatures are no longer restrained by it and can escape from the corpse by using 30 feet of movement.
Claw. Melee Weapon Attack: +19 to hit, reach 15 ft., one target. Hit: 32 (4d10 + 10) slashing damage.
Tail. Melee Weapon Attack: +19 to hit, reach 15 ft., one target. Hit: 28 (4d8 + 10) bludgeoning damage.
Energy Breath (Recharge 5-6). The behemoth exhales energy in a 300-foot line that is 10 ft. wide. Each creature in that line must make a DC 20 Dexterity saving throw, taking 72 (16d8) necrotic or radiant damage (behemoth's choice) on a failed save, or half as much damage on a successful one.
The behemoth can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The behemoth regains spent legendary actions at the start of its turn.
Attack. The behemoth makes one attack with its claw.
Move. The behemoth moves its speed.
Bite (Costs 2 Actions). The behemoth makes one attack with its bite.
Description
At the dawn of creation, the ancient gods fought countless bloody wars amongst themselves, vying for divine supremacy. In these primordial battles, the gods created weapons of such unthinkable power that the very fabric of reality was threatened. Some of these weapons were gargantuan titans that could rip apart dragons and giants as if they were mere insects.
When these divine wars came to an end, the gods that remained were forced to imprison the behemoths that they had created. They locked their creations away in impregnable prisons, buried deep within the bowels of the world. It's possible that the gods imprisoned these creatures so that they could use them again in future conflicts—but it's also possible that the gods were simply incapable of destroying creatures of such immense power.
Power of the Gods. Behemoths have the ability to use the energies of creation against their enemies. They are capable of breathing out streams of energy that can obliterate flesh, metal, and stone. Few creatures can survive a direct hit from such a blast. When the gods imprisoned the behemoths, they were forced to muzzle them with adamantine chains in order to keep such immense primordial energy contained.
Engines of Destruction. Behemoths exist for a single purpose: to annihilate anything and everything. Unlike the bestial tarrasque, behemoths do not eat, sleep, or drink. They are sustained only by an appetite for destruction so vast that even if they were to destroy the world itself, they would still be unsatisfied. In such an event, the victorious behemoth would simply seek new worlds to destroy, drifting through space for aeons until it discovers a new focus for its unquenchable rage.
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