Ancient Crystal Dragon

Gargantuan dragon (gem), Typically Chaotic Neutral
Armor Class 20 (natural armor)
Hit Points 222 (12d20 + 96)
Speed 40 ft., burrow 40 ft., climb 40 ft., fly 80 ft.
STR
25 (+7)
DEX
12 (+1)
CON
26 (+8)
INT
20 (+5)
WIS
16 (+3)
CHA
21 (+5)
Saving Throws Dex +7, Con +14, Wis +9, Cha +11
Skills Perception +15, Stealth +13, Survival +9
Damage Resistances cold, radiant
Senses blindsight 60 ft., darkvision 120 ft., passive Perception 25
Languages Common, Draconic, telepathy 120 ft.
Challenge 19 (22000 XP)     Proficiency Bonus +6
Legendary Resistance (3/Day).
ACTIONS
Multiattack.
Bite.
Claw.
Scintillating Breath (Recharge 5–6).
Spellcasting (Psionics).
BONUS ACTIONS
Change Shape.
Psychic Step.
LEGENDARY ACTIONS
Claw.
Psionics (Costs 2 Actions).
Starlight Strike (Costs 3 Actions).

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

Fizban´s Treasury of Dragons
Ancient Crystal Dragon