Armored Space Whale

Armored Reflective Carapace. Any time the armored space whale is targeted by a magic missile spell, a line spell, a ray spell, or a spell that requires a ranged attack roll. The armored space whale is unaffected, and the effect is reflected back at the caster as though it originated from the tarrasque, turning the caster into the target. Additionally, any critical hit against the armored space whale becomes a normal hit.

Colossal. The armored space whale is one size category bigger then Gargantuan.

Echolocation. The armored space whale can’t use its blindsight while deafened.

Keen Hearing. The armored space whale has advantage on Wisdom (Perception) checks that rely on hearing.

Magic Resistance. The armored space whale has advantage on saving throws against spells and other magical effects.

Magic Weapons. The armored space whale’s weapon attacks are magical.

Siege Monster. The armored space whale deals double damage to objects and structures.

Space Nature. The armored space whale doesn’t require air.

Multiattack. The armored space whale 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: +19 to hit, reach 15 ft., all targets in a 10-foot-radius. Hit: 64 (12d8 + 10) bludgeoning damage. If the target is a Huge or smaller creature, it must succeed on a DC 27 Dexterity saving throw or be swallowed by the armored space whale. While swallowed, the creature is blinded and restrained, it has total cover against attacks and other effects outside the armored space whale, and it takes 35 (10d6) acid damage at the start of each of the armored space whale 's turns.

If the armored space whale takes 50 damage or more on a single turn from a creature inside it, the armored space whale must succeed on a DC 25 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 armored space whale. If the armored space whale dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 30 feet of movement, exiting prone.

Tail. Melee Weapon Attack: +19 to hit, reach 30 ft., all targets in a 10-foot-radius. Hit: 37 (5d10 + 10) bludgeoning damage.

Ram. The armored space whale moves at least 50 feet strait towards a target, it can ram it with its armored head. All creatures in the 30-foot-radius that the armored space whale is ramming must make a DC 27 Dexterity saving throw or take 120 (20d10 + 10) bludgeoning damage and are knocked prone and stunned until the start of the armored space whale’s next turn. Half damage on a successful save and no additional effects. Vehicles make their save with disadvantage.