Ancient Red Dragon

Gargantuan dragon, Chaotic Evil

Armor Class22 (natural armor)
Hit Points546 (28d20 + 252)
Speed40 ft., climb 40 ft., fly 80 ft.
STRDEXCONINTWISCHA
30 (+10) 10 (+0) 29 (+9) 18 (+4) 15 (+2) 23 (+6)
Saving ThrowsCha +13, Con +16, Dex +7, Wis +9
SkillsPerception +16, Stealth +7
Damage Vulnerabilities—
Damage Resistances—
Damage Immunitiesfire
Condition Immunities—
Sensesblindsight 60 ft., darkvision 120 ft., passive Perception 26
LanguagesCommon, Draconic
Challenge24

Traits

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

Claw.

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

Tail.

Melee Attack Roll: +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

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.