Legendary Resistance (10/Day). If SCP-682 fails a saving throw, it can choose to succeed instead.

Magic Resistance. SCP-682 has advantage on saving throws against spells and other magical effects.

Resistance. SCP-682 has resistance to all forms of damage, including bludgeoning, slashing, and piercing damage from magical or silvered weapons.

Regeneration (3/Minute). SCP-682 can regain 8d6 + 30 hit points at the start of every round, and can use an action use regeneration with double the amount of hit points healed.

Adaptability. When SCP-682 takes any type of damage that isn't bludgeoning, piercing or slashing from nonmagical or silvered weapons, the creature that dealt the damage makes an Intelligence Saving Throw, DC 20, or Sleight of Hand check, DC 20. Upon failing the check, SCP-682 gains immunity to any types of damage involved in that attack for the next 5 turns, and can add up to 5d6 of each type of damage dealt to his attacks for the next 5 turns. Whenever a creature uses a class or racial feature or ability within range of SCP-682's perception, SCP-682 makes a Perception check, with the DC being 15 + the target's Deception or Sleight of Hand modifier. Upon succeeding the check, SCP-682 has that class or racial feature added to his special traits for 1d4 + 1 hours, and can use it the same amount of times as the target could at fully charged.

Countermeasures. (5/Day) Whenever SCP-682 is afflicted with a status condition, whenever SCP-682 loses hit points equal to a 1/4 of its maximum hit points, or when it uses a charge (independent to status and hit point drops), SCP-682 can do one of the following:

• Remove any status conditions and activate an additional recovery, healing double the amount of hp rolled.
• Shatter a part of the environment, causing a 30ft radius circle of earth to churn for several seconds. Any creature in range must make a DC22 Dexterity Saving Throw, or be knocked prone. The earth's churning deals 8d8 bludgeoning damage and 2d6 slashing damage on a failed save, and half as much on a successful one. The area of destroyed earth becomes difficult terrain, which SCP-682 can navigate as normal.
• SCP-682 can glow incredibly bright and hot, forcing all creatures within 30ft of it to make a DC 20 Constitution saving throw, dealing 3d6 radiant damage and 3d6 fire damage on a failed save, and half as much on a successful one. Any creature that fails the saving throw is blinded for 2d4 + 1 minutes, and has disadvantage on perception checks for double that time. Any metallic equipment in the area will begin to melt after 30 seconds of exposure in the radius, and fully melts after 1 minute. Holding a metallic weapon or wearing armour in the radius will deal 1d6 fire damage after 3 rounds if a weapon, and 2d6 if armour, with the damage increasing by 1d6 every round the metallic object stays in the radius.
• SCP-682 can cover itself in thick lead plating, raising its AC by 4 and makes itself immune to psychic and radiant damage for 1d10 + 2 minutes, as well as any magical non-damaging effects.
• SCP-682 can lower its body temperature to the point where it can cause the world around it to freeze. Lasting for 1 minute, for every turn creature is within 15ft of SCP-682, they make a DC 20 Constitution saving throw. On a failed save the creature takes 3d6 cold damage, and half as much on a successful one. If the target fails three saving throws in a row, it is restrained until it passes three saves in a row, or until it leaves the radius of SCP-682. Any fire or force damage in this area is halved, and any non-magical projectiles also have their damage halved.
• SCP-682 can form a shield of air that blows rapidly around it in a 15ft radius circle. Any creature that enters this radius must make a DC 20 Dexterity Saving Throw, or be blown out of the radius. Any ranged attacks on a target inside the radius have disadvantage, and any force, fire, cold, lightning, or acid damage in the area is dealt to every creature, including SCP-682.

Multiattack. SCP-682 can make 4 attacks, using any mix of its Bite, Claw, Tail, or Claw Crush.

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 15ft., one target. Hit: 28 (4d8 + 10) slashing damage.

Tail. Melee Weapon Attack: +19 to hit, reach 20ft., 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.

Claw Crush. Melee Weapon Attack: +19 to hit, reach 15ft., one target. Hit: 28 (5d10 + 10) piercing damage.

Attack. SCP-682 can use any attack out of its claw, bite, tail, and claw crush attacks.

Regeneration(3/Minute). SCP-682 can regain 8d6 + 30 hit points, but only if it hasn't used regeneration on it's last turn.

Countermeasure. SCP-682 can use any of its countermeasures features, given that it didn't use Countermeasure on the previous turn, or between its previous turn and now as a legendary action.

Regeneration(3/Minute). SCP-682 can regain 8d6 + 30 hit points if its attacked, but only if it hasn't used regeneration on it's last turn.

Countermeasure(5/Day). SCP-682 can use any of its countermeasures features, given that it didn't use Countermeasure on the previous turn, or between its previous turn and now as a legendary action.

SCP-682 can take 5 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. SCP-682 regains spent legendary actions at the start of its turn.

Attack. SCP-682 makes one claw attack or tail attack.

Countermeasure. SCP-682 can use any of its countermeasures features, given that it didn't use Countermeasure on the previous turn, or between its previous turn and now as a legendary action.

Regeneration(3/Minute). SCP-682 can regain 8d6 + 30 hit points, but only if it hasn't used regeneration on it's last turn.