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)

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.

Running this fight? Add the homunculus to the initiative tracker: type its name and the AC, hit points and initiative bonus fill in, and the book button shows this stat block mid-fight.