Vumrbueth, The Beast from 40,000 feet Below

Multiattack. The Beast can make three attacks: one with its Bite and two with its Claws or two with its Claws and one with its tail.

Bite. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 24 (3d10 + 12) piercing damage.

Claw. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: 15 (2d6 + 8) slashing damage.

Tail. Melee Weapon Attack: +14 to hit, reach 15 ft., one target. Hit: 23 (3d8 + 8) bludgeoning damage.

The Beast can take 3 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 Beast regains spent legendary actions at the start of its turn.

Tail Attack. The Beast makes a Tail attack.

Rend. The Beast can make two Claw attacks.

Rumble (Costs 2 Actions). The Beast rears up and brings its full weight down causing the ground to shake violently. Each creature within 65 feet of The Beast must make a DC 22 Dexterity saving throw or take 10 (2d6 +2) Bludgeoning damage and be knocked prone.