Large Dragon (Chromatic), Chaotic Evil
Traits
Amphibious. The dragon can breathe air and water.
Actions
Multiattack. The dragon makes three Rend attacks.
Rend. Melee Attack Roll: +7, reach 10 ft. Hit: 9 (2d4 + 4) Slashing damage plus 3 (1d6) Acid damage.
Acid Breath (Recharge 5–6). Dexterity Saving Throw: DC 14, each creature in a 30-foot-long, 5-foot-wide Line. Failure: 49 (14d6) Acid damage. Success: Half damage.
Found on p.38 of MM2025 (Free Rules)