Azgore the Tarrasque eater

Godly Resistance (8/Day). If Azgore fails a saving throw, it can choose to succeed.

Reflective skin. If Azgore is targeted by a Magic Missile spell or a spell that requires a ranged attack roll, roll 1d6. On a 1–3, Azgore is unaffected. On a 4-6, Azgore is unaffected and reflects the spell, turning the caster into the target.

Predator's predator. Azgore deals double damage to monsters and players.

Multiattack. Azgore makes one ranged attack and three other attacks, using his sword, foot or fist in any combination.

Superior fist. Melee Attack Roll: +19, reach 15 ft. Hit: 36 (4d12 + 10) blugeoning damage, and the target has the Grappled condition (escape DC 20). Until the grapple ends, the target has the Restrained condition and can’t teleport.

Godly Sword. Melee Attack Roll: +19, reach 15 ft. Hit: 28 (4d8 + 10) Slashing damage.

Kick. Melee Attack Roll: +19, reach 30 ft. Hit: 23 (3d8 + 10) Bludgeoning damage. If the target is a Huge or smaller creature, it has the Prone condition.

Thunderous Bellow (Recharge 5–6). Constitution Saving Throw: DC 27, each creature and each object that isn’t being worn or carried in a 150-foot Cone. Failure: 78 (12d12) Thunder damage, and the target has the Deafened and Frightened conditions until the end of its next turn. Success: Half damage only.

Snap neck. Strength Saving Throw: DC 27, one gargantuan or smaller creature Grappled by Azgore Failure: The target's neck is broken, and the Grappled condition ends. The creature is killed instantly.

Legendary Action Uses: 3. Immediately after another creature’s turn, the tarrasque can expend a use to take one of the following actions. The tarrasque regains all expended uses at the start of each of its turns.

Godly Onslaught. Azgore moves up to half its Speed, and it makes one punch or kick attack.

World-Shaking Movement. Azgore moves up to twice its Speed. At the end of this movement, Azgore creates an instantaneous shock wave in a 60-foot Emanation originating from itself. Creatures in that area lose Concentration and, if Medium or smaller, have the Prone condition. Azgore can’t take this action again until the start of its next turn.