Sources
CR
Type
Size
Alignment
Movement

Blue Dragon Wyrmling

Medium Dragon, Lawful Evil

Armor Class 17 (natural armor)
Hit Points 52 (8d8 + 16)
Speed 30 ft., fly 60 ft., burrow 15 ft.
STR
17
+3
DEX
10
+0
CON
15
+2
INT
12
+1
WIS
11
+0
CHA
15
+2
Saving Throws DEX +2, CON +4, WIS +2, CHA +4
Skills Perception +4, Stealth +2
Damage Immunities lightning
Senses blindsight 10 ft., darkvision 60 ft., passive Perception 14
Languages Draconic
Challenge 3 (700 XP)

Actions

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit:8 (1d10 + 3) piercing damage plus 3 (1d6) lightning damage.

Lightning Breath (Recharge 5–6). The dragon exhales lightning in a 30-foot line that is 5 feet wide. Each creature in that line must make a DC 12 Dexterity saving throw, taking 22 (4d10) lightning damage on a failed save, or half as much damage on a successful one.

Lore

True dragons are winged reptiles of ancient lineage and fearsome power. They are known and feared for their predatory cunning and greed, with the oldest dragons accounted as some of the most powerful creatures in the world. Dragons are also magical creatures whose innate power fuels their dreaded breath weapons and other preternatural abilities.