Medium Dragon (Chromatic), Chaotic Evil
Traits
Amphibious. The dragon can breathe air and water.
Actions
Multiattack. The dragon makes two Rend attacks.
Rend. Melee Attack Roll: +4, reach 5 ft. Hit: 5 (1d6 + 2) Slashing damage plus 2 (1d4) Acid damage.
Acid Breath (Recharge 5–6). Dexterity Saving Throw: DC 11, each creature in a 15-foot-long, 5-foot-wide Line. Failure: 22 (5d8) Acid damage. Success: Half damage.
Found on p.38 of MM2025 (Free Rules)