Armor Class 17
Hit Points 142 (15d10 + 60)
Speed 40 ft., fly 80 ft., swim 40 ft.
Saving Throws DEX +3, WIS +4
Skills Insight +4, Perception +7, Stealth +3
Damage Immunities lightning
Senses Blindsight 30 ft., Darkvision 120 ft., passive Perception 17
Languages Common, Draconic
Challenge 8
Amphibious. The dragon can breathe air and water.
Multiattack. The dragon makes three Rend attacks. It can replace one attack with a use of Repulsion Breath.
Rend. m +8, reach 10 ft. Hit: 16 (2d10 + 5) Slashing damage.
Lightning Breath (Recharge 5–6). dex DC 15, each creature in a 60-foot-long, 5-foot-wide Line. 49 (9d10) Lightning damage. Half damage.
Repulsion Breath. str DC 15, each creature in a 30-foot Cone. The target is pushed up to 40 feet straight away from the dragon and has the Prone condition.
Monster Manual (2024), p. 58