Baby Tarrasque

Tough Shell. When the baby tarrasque is hit by a ranged spell attack, it can use it's reaction to reduce the damage by 1d8.

Gulp. The Baby Tarrasque makes one bite attack against a tiny creature. If the attack hits, the target is instead swallowed. While swallowed, the creature is blinded and restrained, benefits from full cover, and takes 3 (1d6) acid damage at the start of each of the baby tarrasque's turns. The baby tarrasque cannot make another bite attack unless it regurgitates the swallowed creature.

If the baby terrasque takes damage from the swallowed creature, or becomes grappled, it regurgitates the creature, which falls prone 5 feet in front of the baby terrasque.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 3) piercing damage. 

Horns. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) piercing damage.

Tough Shell. When the baby tarrasque is hit by a ranged spell attack, it can use it's reaction to reduce the damage by 1d8.