Huge dragon (fey), neutral good

Armor Class: 22

Hit Points: 411 (33d12 + 198)

Speed: 50 ft , fly: 80 ft

STR

24 +7

DEX

15 +2

CON

23 +6

INT

18 +4

WIS

22 +6

CHA

18 +4

Saving Throws: Dex +8, Wis +12, Cha +10

Skills: Medicine +18, Nature +11, Perception +18, Persuasion +16, Survival +18

Damage Immunities: psychic

Condition Immunities: charmed, frightened

Senses: darkvision 120 ft., passive Perception 28

Languages: Common, Draconic, Sylvan

Challenge Rating: 18

Proficiency Bonus: +5

Actions

Multiattack. The dragon can use its Awesome Presence. It then makes three attacks: one with its bite and two with its claws or the dragon then makes three attacks: one with its bite, one with its claw and one with its tail.   Bite. Melee Weapon Attack: +13 to hit, reach 15 ft., one target. Hit: 18 (2d10 + 7) piercing damage plus 7 (2d6) psychic damage.   Claw. Melee Weapon Attack: +13 to hit, reach 15 ft., one target. Hit: 14 (2d6 + 7) slashing damage.   Tail. Melee Weapon Attack: +13 to hit, reach 20 ft., one target. Hit: 16 (2d8 + 7) bludgeoning damage.   Awesome Presence. Each creature of the dragon's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 19 Wisdom saving throw or become charmed by the dragon 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 the dragon's Awesome Presence for the next 24 hours .   Forceful Pulse (Recharge 5-6). The dragon emits a pulse of magical energy in an 80-foot sphere surrounding it. Each creature in that area must make a DC 21 Constitution saving throw, taking 49 (14d6) force damage on a failed save, or half as much damage on a successful one. Creatures that failed the saving throw are also pushed back 15 feet and are knocked prone.

Legendary Actions

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.   Detect. The dragon makes a Wisdom (Perception) check.   Tail Attack. The dragon makes a tail attack.   Wing Attack. The dragon beats its wings. Each creature within 15 feet of the dragon must succeed on a DC 22 Dexterity saving throw or take 14 (2d6 + 7) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.