Vargouille (CR 2)

Small Outsider (Evil and Extraplanar)
Alignment: Always neutral evil
Initiative: +1 (Dex); Senses: darkvision 60 ft., Listen +5, and Spot +5

AC: 12 (+1 size, +1 Dex), touch 11, flat-footed 11
Hit Dice: 1d8+1 (5 hp)
Fort +3, Ref +3, Will +3
Speed: Fly 30 ft. (good)
Space: 5 ft./5 ft.
Base Attack +1; Grapple -3
Attack: Bite +3 melee
Full Attack: Bite +3 melee
Damage: Bite 1d4 and poison
Special Attacks/Actions: Shriek, poison, kiss
Abilities: Str 10, Dex 13, Con 12, Int 5, Wis 12, Cha 8
Special Qualities:
Feats: Stealthy; Weapon Finesse
Skills: Hide +9, Intimidate +3, Listen +5, Move Silently +5, and Spot +5
Advancement: 2-3 HD (Small)
Climate/Terrain: Tarterian Depths of Carceri
Organization: Cluster (2-5) or swarm (6-11)
Treasure: None

Source: Monster Manual

Shriek (Su): Instead of biting, a vargouille can open its distended mouth and let out a terrible shriek. Those within 60 feet (except other vargouilles) who both hear the shriek and can clearly see the creature must succeed at a Fortitude save (DC 12) or be paralyzed with fear until the monster attacks them, goes out of range, or leaves their sight. A paralyzed creature is susceptible to the vargouille's kiss. If the save is successful, that opponent cannot be affected again by that vargouille's shriek for one day.

Poison (Ex): Bite, Fortitude save (DC 12) or be unable to heal the bite damage naturally or magically. A neutralize poison or heal spell removes the effect, while delay poison allows magical healing.

Kiss (Su): A vargouille can kiss a paralyzed target with a successful melee touch attack, beginning a terrible transformation. The affected opponent must succeed at a Fortitude save (DC 19) or begin to transform, losing all his or her hair 1d6 hours later. After another 1d6 hours, the ears grow into leathery wings, tentacles sprout on the chin and scalp, and the teeth become long, pointed fangs. During the next 1d6 hours, the victim suffers 1d6 points of permanent Intelligence and Charisma drain. The transformation is complete 1d6 hours later, when the head breaks free of the body (which promptly dies) and becomes a vargouille. This transformation is interrupted by sunlight, and even a daylight spell can delay death, but to reverse the transformation requires remove disease.

Skills: +2 on Hide and Move Silently checks.

Evil Subtype

A subtype usually applied only to outsiders native to the evil-aligned Outer Planes. Evil outsiders are also called fiends. Most creatures that have this subtype also have evil alignments; however, if their alignments change, they still retain the subtype. Any effect that depends on alignment affects a creature with this subtype as if the creature has an evil alignment, no matter what its alignment actually is. The creature also suffers effects according to its actual alignment. A creature with the evil subtype overcomes damage reduction as if its natural weapons and any weapons it wields were evil-aligned (see Damage Reduction).

Extraplanar Subtype

A subtype applied to any creature when it is on a plane other than its native plane. A creature that travels the planes can gain or lose this subtype as it goes from plane to plane. This book assumes that encounters with creatures take place on the Material Plane, and every creature whose native plane is not the Material Plane has the extraplanar subtype (but would not have when on its home plane). An extraplanar creatures usually has a home plane mentioned in its description. These home planes are taken from the Great Wheel cosmology of the D&D game (see Chapter 5 of the Dungeon Master's Guide). If your campaign uses a different cosmology, you will need to assign different home planes to extraplanar creatures.

Creatures not labeled as extraplanar are natives of the Material Plane, and they gain the extraplanar subtype if they leave the Material Plane. No creature has the extraplanar subtype when it is on a transitive plane; the transitive planes in the D&D cosmology are the Astral Plane, the Ethereal Plane, and the Plane of Shadow.