Legendary Resistance (3/Day):

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 roll, roll a d6. On a 1 to 5, 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.

Siege Monster:

The tarrasque deals double damage to objects and structures.

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: +19 to hit, reach 10 ft., one target. Hit: 36 (4d12 + 10) piercing damage. If the target is a creature, it is Grappled (escape DC 20). Until this grapple ends, the target is Restrained, and the tarrasque can’t bite another target.

Claw:

Melee Weapon Attack: +19 to hit, reach 15 ft., one target. Hit: 28 (4d8 + 10) slashing damage.

Horns:

Melee Weapon Attack: +19 to hit, reach 10 ft., one target. Hit: 32 (4d10 + 10) piercing damage.

Tail:

Melee Weapon Attack: +19 to hit, reach 20 ft., one target. Hit: 24 (4d6 + 10) bludgeoning damage. If the target is a creature, it must succeed on a DC 20 Strength saving throw or be knocked Prone.

Frightful Presence:

Each creature of the tarrasque’s choice within 120 feet of it and aware of it must succeed on a DC 17 Wisdom saving throw or become Frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, with disadvantage if the tarrasque is within line of sight, ending the effect on itself on a success. If a creature’s saving throw 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 56 (16d6) acid damage at the start of each of the tarrasque’s turns. If the tarrasque takes 60 damage or more on a single turn from a creature inside it, the tarrasque must succeed on a DC 20 Constitution saving throw at the end of that turn 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.

The tarrasque 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 tarrasque regains spent legendary actions at the start of its turn.

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.

Keen Smell:

The tiger has advantage on Wisdom (Perception) checks that rely on smell.

Pounce:

If the tiger moves at least 20 feet straight toward a creature and then hits it with a claw attack on the same turn, that target must succeed on a DC 13 Strength saving throw or be knocked Prone. If the target is Prone, the tiger can make one bite attack against it as a bonus action.

Bite:

Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 8 (1d10 + 3) piercing damage.

Claw:

Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) slashing damage.

Amphibious:

The toad can breathe air and water.

Standing Leap:

The toad’s long jump is up to 20 feet and its high jump is up to 10 feet, with or without a running start.

Bite:

Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 7 (1d10 + 2) piercing damage plus 5 (1d10) poison damage, and the target is Grappled (escape DC 13). Until this grapple ends, the target is Restrained, and the toad can’t bite another target.

Swallow:

The toad makes one bite attack against a Medium or smaller target it is grappling. If the attack hits, the target is swallowed, and the grapple ends. The swallowed target is Blinded and Restrained, it has total cover against attacks and other effects outside the toad, and it takes 10 (3d6) acid damage at the start of each of the toad’s turns. The toad can have only one target swallowed at a time. If the toad dies, a swallowed creature is no longer Restrained by it and can escape from the corpse using 5 feet of movement, exiting Prone.

False Appearance:

While the treant remains motionless, it is indistinguishable from a normal tree.

Seige Monster:

The treant deals double damage to objects and structures.

Multiattack:

The treant makes two slam attacks.

Slam:

Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 16 (3d6 + 6) bludgeoning damage.

Rock:

Ranged Weapon Attack: +10 to hit, range 60/180 ft., one target. Hit: 28 (4d10 + 6) bludgeoning damage.

Animate Trees (1/Day):

The treant magically animates one or two trees it can see within 60 feet of it. These trees have the same statistics as a treant, except they have Intelligence and Charisma scores of 1, they can’t speak, and they have only the Slam action option. An animated tree acts as an ally of the treant. The tree remains animate for 1 day or until it dies; until the treant dies or is more than 120 feet from the tree; or until the treant takes a bonus action to turn it back into an inanimate tree. The tree then takes root if possible.

False Appearance:

While the tree remains motionless, it is indistinguishable from a normal tree.

Slam:

Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 14 (3d6 + 4) bludgeoning damage.

An awakened tree is an ordinary tree given sentience and mobility by the Awaken spell or similar magic.

Trampling Charge:

If the triceratops moves at least 20 feet straight toward a creature and then hits it with a gore attack on the same turn, that target must succeed on a DC 13 Strength saving throw or be knocked Prone. If the target is Prone, the triceratops can make one stomp attack against it as a bonus action.

Gore:

Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 24 (4d8 + 6) piercing damage.

Stomp:

Melee Weapon Attack: +9 to hit, reach 5 ft., one Prone creature. Hit: 22 (3d10 + 6) bludgeoning damage.

Keen Smell:

The troll has advantage on Wisdom (Perception) checks that rely on smell.

Regeneration:

The troll regains 10 hit points at the start of its turn. If the troll takes acid or fire damage, this trait doesn’t function at the start of the troll’s next turn. The troll dies only if it starts its turn with 0 hit points and doesn’t regenerate.

Multiattack:

The troll makes three attacks: one with its bite and two with its claws.

Bite:

Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) piercing damage.

Claw:

Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage.

Multiattack:

The tyrannosaurus makes two attacks: one with its bite and one with its tail. It can’t make both attacks against the same target.

Bite:

Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 33 (4d12 + 7) piercing damage. If the target is a Medium or smaller creature, it is Grappled (escape DC 17). Until this grapple ends, the target is Restrained, and the tyrannosaurus can’t bite another target.

Tail:

Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 20 (3d8 + 7) bludgeoning damage.