The Tarrasque

The legendary tarrasque is possibly the most dreaded monster of the Material Plane. It is widely believed that only one of these creatures exists, though no one can predict where and when it will strike. 

A scaly biped, the tarrasque is fifty feet tall and seventy feet long, weighing hundreds of tons. It carries itself like a bird of prey, leaning forward and using its powerful lashing tail for balance. Its cavernous maw yawns wide enough to swallow all but the largest creatures, and so great is its hunger that it can devour the populations of whole towns.

Legendary Destruction.

The destructive potential of the tarrasque is so vast that some cultures incorporate the monster into religious doctrine, weaving its sporadic appearance into stories of divine judgment and wrath. Legends tell how the tarrasque slumbers in its secret lair beneath the earth, remaining in a dormant state for decades or centuries. When it awakens in answer to some inscrutable cosmic call, it rises from the depths to obliterate everything in its path.

Damage Immunities fire, poison; bludgeoning, piercing, and

slashing from non magical weapons 

Condition Immunities charmed, frightened, paralyzed, poisoned

Magical Resistance

Legendary Resistance. If the tarrasque fails a saving throw, it can choose to succeed instead. Magic Resistance. The tarrasque has advantage on saving throws against spells and other magical effects. 

Reflective Carapace. 

Any time the tarrasque is targeted by a magic missile spell, a line spell, or a spell that requires a ranged attack. Sometimes the tarrasque is unaffected. On a 6, the tarrasque is unaffected, and the effect is reflected back at the caster as though it originated from the tarrasque, turning the caster into the target.

Claw. Melee Weapon Attack: one target. Hit: slashing damage. Horns. Melee Weapon Attack: reach 10ft., one target. Hit: piercing damage. Tail. Melee Weapon Attack: reach 20ft., one target. Hit: bludgeoning damage. If the target is a creature, it must keep its balance or be knocked prone.

Multiattack.

The tarrasque can use its Frightful Presence. It then makes five attacks: one with its bite, two with its claws, one with its horns, and one with its tail. It can use its Swallow instead of its bite.

Bite.

Melee Weapon Attack: one target. Hit piercing damage. If the target is a creature, it is grappled. Until this grapple ends, the target is restrained, and the tarrasque can't bite another target.

Siege Monster.

The tarrasque deals huge damage to objects and structures.

Frightful Presence.

Each creature of the tarrasque's choice within 120 feet of it and aware of it must succeed in resisting its presence or become frightened for 1 minute. A creature can try to resist, with disadvantage if the tarrasque is within line of sight, ending the effect on itself on a success. If a creature is successful or the effect ends for it, the creature is immune to the tarrasque's Frightful Presence for the next 24 hours. 

Swallow.

The tarrasque makes one bite attack against a Large or smaller creature it is grappling. If the attack hits, the target takes the bite's damage, the target is swallowed, and the grapple ends. While swallowed, the creature is blinded and restrained, it has total cover against attacks and other effects outside the tarrasque, and it takes acid damage. If the tarrasque takes a large strike or more from a creature inside it, the tarrasque must try to hold it in or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the tarrasque. If the tarrasque dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 30 feet of movement, exiting prone.

LEGENDARY ACTIONS

The tarrasque can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time. The tarrasque regains spent legendary actions after some time. Attack. The tarrasque makes one claw attack or tail attack. Move. The tarrasque moves up to half its speed. Chomp (Costs 2 Actions). The tarrasque makes one bite attack or uses its Swallow.