Growing Big and Strong. As the Caterpillar consumes, it grows in size. Every time the Caterpillar swallows two or more creatures or objects one size smaller than it, it increases in size by one degree, up to Gargantuan, at the end of its turn if the creatures or objects are still inside the caterpillar. When the Caterpillar increases in size, its current and maximum HP increase by 13 (3d8) and damage dealt by its Bite attack increases by 6 (1d12) piercing damage.
Bite. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 29 (4d12 + 4) piercing damage + 22 (4d10) acid damage, and the target is grappled (escape DC16). Until this grappled ends the target is restrained and the caterpillar cannot bite another target.
Consume. The caterpillar makes one bite attack against a target equal to or smaller than its current size that 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 caterpillar, and it takes 52 (8d12) acid damage at the start of each of the caterpillar's turns.
If the caterpillar takes 24 or more damage in a single turn from a creature inside it, the caterpillar must make a DC17 Constitution saving throw or regurgitate all swallowed creatures and objects, which fall prone in a space within 10 feet of the caterpillar. If the caterpillar dies, a swallowed creature is no longer restrained by it and can escape from the corpse using 10 feet of movement, exiting prone.
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