Huge Dragon (Chromatic), Lawful Evil
Armor Class 19 Initiative +11 (21) Hit Points 207 (18d12 + 90) Speed 40 ft., Fly 80 ft., Swim 40 ft.
Saving Throws Str +6, Dex +6, Con +5, Int +4, Wis +7, Cha +4
Skills Deception +9, Perception +12, Persuasion +9, Stealth +6
Damage Immunities Poison; Poisoned
Senses Blindsight 60 ft., Darkvision 120 ft.; Passive Perception 22
Languages Common, Draconic
Challenge Rating 15
The dragon can breathe air and water.
If the dragon fails a saving throw, it can choose to succeed instead.
The dragon makes three Rend attacks. It can replace one attack with a use of Spellcasting to cast Mind Spike (level 3 version).
Melee Attack Roll: +11, reach 10 ft. Hit: 15 (2d8 + 6) Slashing damage plus 7 (2d6) Poison damage.
Constitution Saving Throw: DC 18, each creature in a 60-foot Cone. Failure: 56 (16d6) Poison damage. Success: Half damage.
The dragon casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 17):
At Will: Detect Magic, Mind Spike (level 3 version)
1/Day: Geas
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.
The dragon uses Spellcasting to cast Mind Spike (level 3 version).
Constitution Saving Throw: DC 17, each creature in a 20-foot-radius Sphere centered on a point the dragon can see within 90 feet. Failure: 7 (2d6) Poison damage, and the target takes a −2 penalty to AC until the end of its next turn. Failure or Success: The dragon can't take this action again until the start of its next turn.
The dragon moves up to half its Speed, and it makes one Rend attack.