Qorgeth

Legendary Resistance (3/Day). If Qorgeth fails a saving throw, it can choose to succeed instead.

Magic Resistance. Qorgeth has advantage on saving throws against spells and other magical effects.

Magic Weapons. Qorgeth's weapon attacks are magical.

Tunneler. Qorgeth can burrow through solid rock and leaves a 15-foot-diameter tunnel in its wake.

Multiattack. Qorgeth makes one Bite attack, two Crush attacks, and one Stinger attack.

Bite. Melee Weapon Attack: +16 to hit, reach 10 ft., one target. Hit: 22 (2d12 + 9) piercing damage. If the target is a Large or smaller creature, it must succeed on a DC 21 Dexterity saving throw or be swallowed by Qorgeth. A swallowed creature is blinded and restrained, it has total cover against attacks and other effects outside the worm, and it takes 16 (3d10) necrotic damage at the start of each of Qorgeth's turns.

Crush. Melee Weapon Attack: +16 to hit, reach 10 ft., one target. Hit: 20 (2d10 + 9) bludgeoning damage, and if the target is a Large or smaller creature, it is restrained until Qorgeth moves. A creature, including the restrained creature, can use an action to free the restrained creature by succeeding on a DC 21 Strength check.

Stinger. Melee Weapon Attack: +16 to hit, reach 15 ft., one target. Hit: 23 (4d6 + 9) piercing damage, and the target must make a DC 21 Constitution saving throw. On a failure, the target takes 33 (6d10) poison damage and is poisoned for 1 hour. On a success, the target takes half the damage and isn't poisoned. A creature that fails the saving throw by 10 or more is also paralyzed while poisoned in this way.

Spellcasting. Qorgeth casts one of the following spells, requiring no material or somatic components and using Charisma as the spellcasting ability (spell save DC 19): At will: black tentacles, detect magic 3/day each: dispel magic, insect plague (biting worms) 1/day each: earthquake, teleport (self only)

Shriek. Each creature within 60 feet of Qorgeth and that can hear the demon must succeed on a DC 21 Wisdom saving throw or be frightened for 1 minute. The creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Death Roll (Costs 2 Actions). Qorgeth moves up to half its speed straight toward a creature and makes one Crush attack against the creature. Each object and structure between Qorgeth and the target takes 33 (6d10) bludgeoning damage.

Devour (Costs 3 Actions). Qorgeth makes one Bite attack.