Traits
Amphibious: The dragon can breathe air and also water.
Actions
Bite: Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 7 (1d10 + 2) piercing damage plus 2 (1d4) acid damage.
Acid Breath (Recharge 5-6) : Here the dragon will breath out acid in a 15-foot line which is 15 feet wide. But each and every creature which is in that line must make a DC 11 Dexterity Saving Throw and also taking 22 (5d8) acid damage on a failed save or else half as much damage on a successful one.
Black Dragon Wyrmling 5e Monsters Attributes
| AC | 17 (Natural Armor) | 
| Alignment | Chaotic Evil | 
| CHA | 13 | 
| CON | 13 | 
| Challenge Rating | 2 | 
| DEX | 14 | 
| HP | 33 (6d8+6) | 
| INT | 10 | 
| Immunities | Acid | 
| Languages | Draconic | 
| Passive Perception | 14 | 
| Roll 0 | Bite 1d20 + 4 1d10+2 | 
| Roll 1 | Acid Breath 1d20 + 0 5d8 | 
| STR | 15 | 
| Saving Throws | Dex +4, Con +3, Wis +2, Cha +3 | 
| Senses | Blindsight 10 Ft., Darkvision 60 Ft. | 
| Size | Medium | 
| Skills | Perception +4, Stealth +4 | 
| Speed | 30 ft., fly 60 ft., swim 30 ft. | 
| Type | dragon | 
| WIS | 11 |