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

Dual Wand Wielder. If Klauth is carrying two wands, he can use an action to expend 1 charge from each wand, triggering the effects of both wands simultaneously.

Special Equipment. Klauth carries a wand of fireballs and a wand of lightning bolts, and he wears a ring of cold resistance.

Spellcasting. Klauth casts one of the following spells, requiring no material components and using Charisma as the spellcasting ability (spell save DC 22):

At will: comprehend languages, detect magic, mage hand, minor illusion, prestidigitation

1/day each: banishment, cloudkill, disintegrate, etherealness, find the path (cast as 1 action), greater invisibility, haste, locate object, mass suggestion, mirage arcane (cast as 1 action), prismatic spray

2/day each: darkness, detect thoughts, ice storm

Multiattack. Klauth can use his Frightful Presence. He then makes three attacks: one with his bite and two with his claws.

Bite. Melee Weapon Attack: +17 to hit, reach 15 ft., one target. Hit:21 (2d10 + 10) piercing damage plus 14 (4d6) fire damage.

Claw. Melee Weapon Attack: +17 to hit, reach 10 ft., one target. Hit:17 (2d6 + 10) slashing damage.

Tail. Melee Weapon Attack: +17 to hit, reach 20 ft., one target. Hit:19 (2d8 + 10) bludgeoning damage.

Frightful Presence. Each creature of Klauth's choice that is within 120 feet of Klauth and aware of him must succeed on a DC 21 Wisdom saving throw or become frightened 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. If a creature's saving throw is successful or the effect ends for it, the creature is immune to Klauth's Frightful Presence for the next 24 hours.

Fire Breath (Recharge 5–6). Klauth exhales fire in a 90-foot cone. Each creature in that area must make a DC 24 Dexterity saving throw, taking 91 (26d6) fire damage on a failed save, or half as much damage on a successful one.

Detect. Klauth makes a Wisdom (Perception) check.

Tail Attack. Klauth makes a tail attack.

Wing Attack (Costs 2 Actions). Klauth beats his wings. Each creature within 15 feet of Klauth must succeed on a DC 25 Dexterity saving throw or take 17 (2d6 + 10) bludgeoning damage and be knocked prone. Klauth can then fly up to half his flying speed.