Ancient Red Dragon

Gargantuan Dragon (Chromatic), Chaotic Evil

AC 22 Initiative +14 (24) HP 507 (26d20 + 234) Speed 40 ft., Climb 40 ft., Fly 80 ft.

STR 30 +10 +10 DEX

DEX 10 +0 +7 CON 29

CON 29 +9 +9 INT

INT 18 +4 +4 WIS

WIS 15 +2 +9 CHA 27

CHA 27 +8 +8 +8 +8

Skills

Perception +16, Stealth +7

Immunities

Fire

Senses

Blindsight 60 ft., Darkvision 120 ft.; Passive Perception 26

Languages

Common, Draconic

CR

24 (XP 62,000, or 75,000 in lair; PB +7)

Traits

Legendary Resistance (4/Day, or 5/Day in Lair). If the dragon fails a saving throw, it can choose to succeed instead.

Actions

Multiattack. The dragon makes three Rend attacks. It can replace one attack with a use of Spellcasting to cast Scorching Ray (level 3 version).

Rend. Melee Attack Roll: +17, reach 15 ft. Hit: 19 (2d8 + 10) Slashing damage plus 10 (3d6) Fire damage.

Fire Breath (Recharge 5–6). Dexterity Saving Throw: DC 24, each creature in a 90-foot Cone. Failure: 91 (26d6) Fire damage. Success: Half damage.

Spellcasting. The dragon casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 23, +15 to hit with spell attacks):

 At Will: Command (level 2 version), Detect Magic, Scorching Ray (level 3 version)

 1/Day Each: Fireball (level 6 version), Scrying

Legendary Actions

Legendary Action Uses: 3 (4 in Lair). Immediately after another creature's turn, the dragon can expend a use to take one of the following actions. The dragon regains all expended uses at the start of each of its turns.

Commanding Presence. The dragon uses Spellcasting to cast Command (level 2 version). The dragon can't take this action again until the start of its next turn.

Fiery Rays. The dragon uses Spellcasting to cast Scorching Ray (level 3 version). The dragon can't take this action again until the start of its next turn.

Pounce. The dragon moves up to half its Speed, and it makes one Rend attack.