n tiny construct 

Perception +3; darkvision

Languages Common (Can't Speak Any Language); master link

Skills Acrobatics +5, Stealth +5

Str -1 Dex +3 Con +0 Int +0 Wis +1 Cha -2

Master Link (arcane, divination, mental) A homunculus can't speak, but it is telepathically linked to its creator. It can share information back and forth, including its master's knowledge and everything the homunculus hears. The range of this link is 1,500 feet. The homunculus adopts the same alignment as its creator and is utterly faithful. If the homunculus is destroyed, the master takes 2d10 mental damage. If the master is slain, the homunculus becomes mindless, claims its current location as its lair, and instinctively attacks anyone who comes near.

AC  17; Fort +2, Ref +7, Will +3

HP 17

Speed 15 feet, fly 40 feet

Melee [>] jaws +7 (finesse, magical), Damage 1d4 piercing plus homunculus poison

Homunculus Poison (poison) A homunculus has one dose of poison in a reservoir in its head. It can refill this poison from its reserves with an Interact action. Saving Throw DC 15 Fortitude; Maximum Duration 6 rounds; Stage 1 1d6 poison and enfeebled 1 (1 round)

Bestiary, page 208. Expanded in LOIL.