Homunculus (CR 1)

Tiny Construct
Alignment: Any (same as creator)
Initiative: +2 (Dex); Senses: Listen +4 and Spot +4
Languages: Cannot speak, telepathically links to its creator

AC: 14 (+2 size, +2 Dex), touch 14, flat-footed 12
Hit Dice: 2d10 (11 hp)
Fort +0, Ref +4, Will +1
Speed: 20 ft., fly 50 ft. (good)
Space: 2 1/2 ft./0 ft,
Base Attack +1; Grapple -8
Attack: Bite +2 melee
Full Attack: Bite +2 melee
Damage: Bite 1d4-1 and poison
Special Attacks/Actions: Poison
Abilities: Str 8, Dex 15, Con -, Int 10, Wis 12, Cha 7
Special Qualities: Construct
Feats: Lightning Reflexes
Skills: Hide +14, Listen +4, and Spot +4
Advancement: 3-6 HD (Tiny)
Climate/Terrain: Any land and underground
Organization: Solitary
Treasure: None

Source: Monster Manual


Homunculi land on their victims and bite with their venomous fangs.

Poison (Ex): Bite, Fortitude save (DC 11); initial damage sleep for 1 minute, secondary damage sleep for another 5d6 minutes.

Construct: Immune to mind-influencing effects, poison, disease, and similar effects. Not subject to critical hits, subdual damage, ability damage, energy drain, or death from massive damage.