Blue Dragon Wyrmling

Medium dragon, lawful evil

Armor Class: 17 (natural armor)
Hit Points: 52 (8d8+16)
Speed: 30 ft., burrow 15 ft., fly 60 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)
Proficiency Bonus: +2

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.

How many for your party

Copies of the blue dragon wyrmling (700 XP each) against a party of four characters of the same level. Build mixed fights in the encounter builder.

Number of Blue Dragon Wyrmling for each difficulty, party of four
Party level	Easy	Medium	Hard	Deadly
Level 2	—	—	1	2–20
Level 3	—	1	—	2–20
Level 5	—	2	3	4–20
Level 6	2	—	3	4–20
Level 7	2	3	4	5–20
Level 8	2	3	4–5	6–20

In these lists

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Questions

What CR is the Blue Dragon Wyrmling?

The Blue Dragon Wyrmling is challenge 3, worth 700 XP, with a proficiency bonus of +2.

How many hit points does the Blue Dragon Wyrmling have?

52 hit points (8d8+16), with AC 17 from natural armor.

How many should I use against four 2nd-level characters?

Against four level 2 characters, 1 is hard by the encounter XP budget.