Homunculus

Tiny construct, neutral

Armor Class: 13 (natural armor)
Hit Points: 5 (2d4)
Speed: 20 ft., fly 40 ft.

STR: 4 (−3)
DEX: 15 (+2)
CON: 11 (+0)
INT: 10 (+0)
WIS: 10 (+0)
CHA: 7 (−2)

Damage Immunities: poison
Condition Immunities: charmed, poisoned
Senses: darkvision 60 ft., passive Perception 10
Languages: understands the languages of its creator but can't speak
Challenge: 0 (10 XP)
Proficiency Bonus: +2

Telepathic Bond. While the homunculus is on the same plane of existence as its master, it can magically convey what it senses to its master, and the two can communicate telepathically.

Actions

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 1 piercing damage, and the target must succeed on a DC 10 Constitution saving throw or be poisoned for 1 minute. If the saving throw fails by 5 or more, the target is instead poisoned for 5 (1d10) minutes and unconscious while poisoned in this way.

How many for your party

Copies of the homunculus (10 XP each) against a party of four characters of the same level. Build mixed fights in the encounter builder.

Number of Homunculus for each difficulty, party of four
Party level	Easy	Medium	Hard	Deadly
Level 1	5–7	8–10	11–13	14–20
Level 2	8–13	14	15–19	20
Level 3	11–14	15–20	—	—

In these lists

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Questions

What CR is the Homunculus?

The Homunculus is challenge 0, worth 10 XP, with a proficiency bonus of +2.

How many hit points does the Homunculus have?

5 hit points (2d4), with AC 13 from natural armor.

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

Against four level 1 characters, 8–10 is medium and 11–13 is hard by the encounter XP budget.