Armor Class 16 (natural armor)
Hit Points 45 (6d8 + 18)
Speed 30 ft., fly 60 ft., climb 30 ft., burrow 15 ft.
Saving Throws DEX +4, CON +5, WIS +3, CHA +4
Skills History +4, Perception +5, Persuasion +6, Stealth +4
Damage Resistances lightning, thunder
Condition Immunities frightened
Senses blindsight 30 ft., darkvision 120 ft., passive Perception 15
Languages Draconic, telepathy 120 ft.
Challenge 3
Spider Climb. The dragon can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
Tunneler. The dragon can burrow through solid rock at half its burrowing speed and can leave a 5-foot-diameter tunnel in its wake.
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 8 (1d10 + 3) piercing damage plus 3 (1d6) thunder damage.
Debilitating Breath (Recharge 5–6). The dragon exhales a pulse of high-pitched, nearly inaudible sound in a 15-foot cone. Each creature in that area must make a DC 13 Constitution saving throw. On a failed save, the creature takes 22 (4d10) thunder damage and is incapacitated until the end of its next turn. On a successful save, the creature takes half as much damage and isn't incapacitated.
Fizban's Treasury of Dragons, p. 216