Deathfang (CR 3)

Small Undead
Alignment: Always neutral evil
Initiative: +3 (Dex}; Senses: Listen +8 and Spot +8

AC: 17 (+1 size, +3 Dex, +3 natural) touch 14, flat-footed 14
Hit Dice: 1d12 (6 hp)
Fort +0, Ref +3, Will +3
Speed: 20 ft., climb 20 ft., fly 20 ft. (average)
Space: 5 ft. (coiled)/5 ft.
Base Attack +0; Grapple -6
Attack: Bite +4 melee
Full Attack: Bite +4 melee
Damage: Bite 1d3-2
Special Attacks/Actions: Chilling bite, improved grab, constrict
Abilities: Str 6, Dex 17, Con -, Int 1, Wis 12, Cha 2
Special Qualities: Undead
Feats: Alertness; Weapon Finesse (bite)
Skills: Balance +11, Climb +12, Hide +12, Listen +8, and Spot +8
Advancement: -
Climate/Terrain: Any land and underground
Organization: Solitary
Treasure/Possessions: None

Source: Races of Faerûn

Chilling Bite (Su): Living creatures bit by a deathfang bite attack gain one negative level. The Fortitude save to remove the negative level has a DC of 11.

Improved Grab (Ex): To use this ability, the deathfang must hit with its bite attack. If it gets a hold, it can constrict.

Constrict (Ex): A deathfang deals 1d3-2 points of damage with a successful grapple check against Tiny or smaller creatures.

Skills: Deathfangs receive a +4 racial bonus on Hide, Listen, and Spot checks, and a +8 racial bonus on Balance checks. They can use either their Strength or Dexterity modifier for Climb checks, whichever is better.

Deathfangs bite with their needle-sharp fangs but lack the acid spittle of their living brethren.

Flying snakes can be transformed into undead horrors known as deathfangs by means of a create undead spell if the caster is of 11th level or higher. Deathfangs are often found as guardians, utterly loyal to their creator.

A deathfang can be acquired as a familiar with the Improved Familiar feat, beginning at 7th level if the character is of evil alignment and has the Spell Focus (Necromancy) feat.