Corrupted Argynvost

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

Multiattack. It then makes three attacks: two with its claws and one with its tail.

Claw. Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 15 (2d6 + 8) slashing damage.

Tail. Melee Weapon Attack: +13 to hit, reach 15 ft., one target. Hit: 17 (2d8 + 8) bludgeoning damage.

Breath Weapons (Recharge 5–6). The dragon uses one of the following breath weapons.

Poisonius Spew. The dragon regurgitzates an acidic, poisonous liquid around himself. Creatures within 20 feet must succeed on a DC 20 Dexterity saving throw or take 67 (22d6) poison damage.

Paralyzing Breath. The dragon exhales paralyzing gas in a 60-foot cone. Each creature in that area must succeed on a DC 20 Constitution saving throw or be paralyzed for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Swallow. The dragon makes one claw attack against a large or smaller creature it is grappling. If the attack hits, the target takes the claw damage, it is thrown into the dragon's mouth, and it is swallowed. While swallowed, the target is blinded and restrained, it has total cover against attacks and other effects outside the dragon, and it takes 34 (11d6) poison damage at the start of each of the dragon's turns. If the dragon takes 40 damage or more on a single turn from a creature inside it, it must succeed on a DC 21 Constitution saving throw atr the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the dragon. If the dragon dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 20 feet of movement, exiting prone.

The dragon 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 dragon regains spent legendary actions at the start of its turn.

Tail Attack. The dragon makes a tail attack.

Stomp Attack(Costs 2 Actions). The dragon beats its wings. Each creature within 10 feet of the dragon must succeed on a DC 21 Dexterity saving throw or take 15 (2d6 + 8) bludgeoning damage and be knocked prone.