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Magmin

Small elemental, chaotic neutral

Armor Class: 14 (natural armor)
Hit Points: 9 (2d6+2)
Speed: 30 ft.

STR: 7 (−2)
DEX: 15 (+2)
CON: 12 (+1)
INT: 8 (−1)
WIS: 11 (+0)
CHA: 10 (+0)

Damage Resistances: bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities: fire
Senses: darkvision 60 ft., passive Perception 10
Languages: Ignan
Challenge: 1/2 (100 XP)
Proficiency Bonus: +2

Death Burst. When the magmin dies, it explodes in a burst of fire and magma. Each creature within 10 ft. of it must make a DC 11 Dexterity saving throw, taking 7 (2d6) fire damage on a failed save, or half as much damage on a successful one. Flammable objects that aren't being worn or carried in that area are ignited.

Ignited Illumination. As a bonus action, the magmin can set itself ablaze or extinguish its flames. While ablaze, the magmin sheds bright light in a 10-foot radius and dim light for an additional 10 ft.

Actions

Touch. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 7 (2d6) fire damage. If the target is a creature or a flammable object, it ignites. Until a target takes an action to douse the fire, the target takes 3 (1d6) fire damage at the end of each of its turns.

How many for your party

Copies of the magmin (100 XP each) against a party of four characters of the same level. Build mixed fights in the encounter builder.

Number of Magmin for each difficulty, party of four
Party level	Easy	Medium	Hard	Deadly
Level 1	1	—	2	3–20
Level 2	2	—	3	4–20
Level 3	2	3–4	5–6	7–20
Level 4	3–4	5–6	7	8–20
Level 5	5–7	8–10	11–14	15–20
Level 6	6–9	10–11	12–14	15–20

Questions

What CR is the Magmin?

The Magmin is challenge 1/2, worth 100 XP, with a proficiency bonus of +2.

How many hit points does the Magmin have?

9 hit points (2d6+2), with AC 14 from natural armor.

How many should I use against four 1st-level characters?

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