Copper Dragon Wyrmling A5E

Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 13 (2d10 + 2) piercing damage.

The dragon uses one of the following breath weapons:

The dragon exhales acid in a 20-foot-long 5-foot wide-line. Each creature in the area makes a DC 11 Dexterity saving throw taking 13 (3d8) acid damage on a failed save or half damage on a success.

The dragon exhales toxic gas in a 15-foot cone. Each creature in the area makes a DC 11 Constitution saving throw becoming slowed for 1 minute on a failure. A creature repeats the saving throw at the end of each of its turns ending the effect on itself on a success.