Big Ass Rat

Action Name. The Rat makes 2 claw attacks and one bite

Claw. Melee Weapon Attack: +8 to hit, reach 10 ft. one target Hit:  (2d6 + 5) [Slashing] damage. 

Bite. Melee Weapon Attack: +8 to hit, reach 5 ft. one target Hit : (2d6 + 5) [Bludegoning] damage. If the rat bites a creature it must make a DC 14 Dexterity saving throw or be shoved into a cheek pouch. Creatures in cheek pouches are restrained and are released if the rat takes 10 damage in a single turn.

Crush: As a bonus action the rat can lay on top of a creature dealing no damage but forcing the creature it crushes to make a DC 18 strength saving throw or be prone and restrained. The creature can re-make the check at the beginning of its turn to heave the rat off it.

The Rat can take 2 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The Rat regains spent legendary actions at the start of its turn.

Bite but Big (Costs 2 Actions) The Rat makes a bite attack this time forcing the creature to make a DC 16 Dex Save or be swallowed taking 5 acid damage at the start of its turn. It is released if the rat takes 10 damage in a single turn.