Ancient Red Dragon - Mythic Arcanum

Chromatic Dragon

Gargantuan dragon, chaotic evil

Armour Class: 22 (natural armour)
Hit Points: 546 (28d20 + 252)
Speed: 40 ft., climb 40 ft., fly 80 ft.

STR	DEX	CON
30 (+10)	10 (+0)	29 (+9)
INT	WIS	CHA
18 (+4)	15 (+2)	23 (+6)

Saving Throws: Dex +7, Con +16, Wis +9, Cha +13
Skills: Perception +16, Stealth +7
Damage Immunities: fire
Senses: blindsight 60 ft., darkvision 120 ft., passive Perception 26
Languages: Common, Draconic
Challenge: 24 (62,000 XP)

Abilities

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

Actions

Multiattack – The dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its 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 the dragon’s choice that is within 120 feet of the dragon and aware of it 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 the dragon’s Frightful Presence for the next 24 hours.

Fire Breath (Recharge 5–6) – The dragon 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.

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