Legendary Resistance (2/Day). If Yol Vith Tin fails a saving throw, it can choose to succeed instead.

Scaled Toughness His scales make him resistant to certain types of physical harm. Yol has resistance to piercing and slashing damage.

Dragon’s Voice. As a bonus action, you can make your voice audible up to 300 feet away for 1 minute.

Dragon’s Wiles. You have advantage on Charisma (Persuasion) checks.

Multiattack. Yol Vith Tin makes two Greatsword attacks.

Greataxe. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 12 (2d6+5) slashing damage plus 13 (3d8) Fire damage.

Tail. Melee Weapon Attack: +10 to hit, reach 15 ft., one target. Hit: 14 (2d8 + 5) bludgeoning damage.

Flame Breath (Recharge 6). Yol Vith Tin  exhales fire in a 30-foot cone. Each creature in that area must make a DC 16 Dexterity saving throw. On a failed save, the creature takes 36 (8d8) fire damage. On a successful save, the creature takes half as much damage.

Frightful Presence Bonus Action
As a bonus action, Yol manifests his frightful presence. Each creature of his choice that is within 120 feet of him and aware of him must make a Wisdom saving throw against a DC 16. A creature that fails becomes frightened of Yol 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.

Yol Vith Tin 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.

Detect. Yol Vith Tin makes a Wisdom (Perception) check.

Tail Attack. Yol Vith Tin manifests his tail and makes a tail attack.

Wing Attack (Costs 2 Actions). Yol Vith Tin beats his wings. Each creature within 5 feet of Yol Vith Tin must succeed on a DC 16 Dexterity saving throw or take 12 (2d6 + 5) bludgeoning damage and be knocked prone. Yol Vith Tin can then fly up to half its flying speed.