tarrasque magic resistance. Remnants of the profane magic that transformed them still linger in Vinvets's scales, causing them to glimmer in the pale light. The cave dinosaur has advantage on Saving Throws against all Spells and magical Effects.

tarrasque resistance. Yinvets being a baby tarrasque is accustomed to the natural environment and is immune to damage and exhaustion from the natural environment.

Multiattack. Yinvets makes two attacks: one with its bite or two with claws and one with its tail. It can't make both attacks against the same target.

Claws. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 17 (2d6 + 4) [Slashing] damage. 

Bite. Melee Weapon Attack:  +6 to hit, reach 5 ft., one target. Hit: 17 (2d12 + 4) [piercing] damage. If the target is a Medium or smaller creature, it is grappled (escape DC 14). Until this grapple ends, the target is restrained, and vinvets can't bite another target.

Tail. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 17 (2d8 + 4) [bludgeoning] damage.

Swallow. Yinvets makes one bite attack against a Small or Tiny target it is grappling. If the Attack hits, the target is also swallowed, and the grapple ends. While swallowed, the target is (blinded) and (restrained), it has total cover against attacks and other effects outside the Yinvets, and it takes 10 (3d6 ) acid damage at the start of each of the Yinvets' turns. Yinvets can have only one creature swallowed at a time.