Chromatic Greatwyrm

Gargantuan Dragon (Chromatic), Typically Chaotic Evil
Armor Class 22 (natural armor)
Hit Points 533 (26d20 + 260)
Speed 60 ft., burrow 60 ft., fly 120 ft., swim 60 ft.
STR
30 (+10)
DEX
14 (+2)
CON
30 (+10)
INT
21 (+5)
WIS
20 (+5)
CHA
26 (+8)
Saving Throws Dex +10, Con +18, Wis +13, Cha +16
Skills Intimidation +16, Perception +21, Stealth +10
Damage Immunities acid (black), cold (white), fire (red), lightning (blue), or poison (green)
Condition Immunities charmed, frightened, poisoned
Senses truesight 120 ft., passive Perception 31
Languages Common, Draconic
Challenge 27 (105000 XP)     Proficiency Bonus +8
Chromatic Awakening (Recharges after a Short or Long Rest).
Legendary Resistance (4/Day).
Unusual Nature.
ACTIONS
Multiattack.
Bite.
Claw.
Tail.
Breath Weapon (Recharge 5-6).
LEGENDARY ACTIONS
Attack.
Wing Attack (Costs 2 Actions).
Arcane Spear (Costs 3 Actions).
MYTHIC ACTIONS
Bite.
Chromatic Flare (Costs 2 Actions).

This full creature's stat block is not available (not OGL).

Fizban“s Treasury of Dragons
Chromatic Greatwyrm