Bonespitter (CR 3)

Medium Undead
Alignment: Always chaotic evil
Initiative: +7 (Dex)

AC: 22 (+7 Dex, +5 natural), touch 17, flat-footed 15
Hit Dice: 2d12+3 (16 hp); DR: 5/magic
Fort +0, Ref +7, Will -1
Speed: 40 ft.
Space: 5 ft./5 ft.
Base Attack +1; Grapple +2
Attack: Slam +2 melee; or bone shards +8 ranged
Full Attack: Slam +2 melee; or bone shards +8 ranged
Damage: Slam 1d6+1, bone shards 3d4+1
Special Attacks/Actions: Bone shards, disease, frightful presence
Abilities: Str 13, Dex 24, Con -, Int 2, Wis 2, Cha 19
Special Qualities: resistance 20, displacement, counterspelling, +4 turn resistance, undead traits
Feats: Improved Natural Attack (B); Toughness
Skills: Balance +12, Hide +7, and Move Silently +7
Advancement: 3-6 HD (Medium-size)
Climate/Terrain: Any
Organization: Solitary or pack (2-20)
Treasure: None

Source: Dragon #287
Dragon Compendium Vol. 1

The bonespitter is a disgusting undead abomination common throughout the Spire Island. No two bonespitters look alike, although they all share the same basic features. When the Chaos Spire manifests in a new plane, it absorbs most of the intelligent creatures in the area of its appearance. These poor victims are then manifested in the Chaos Spire as bonespitters.

A bonespitter is a terrible stew of arms, legs, torsos, and heads, mixed together with plant and animal matter. The bonespitter moves about on those arms and legs nearest its base and is nimble despite its ungainly appearance. Non-living matter is mixed into the mess; bonespitter skin is patchy with streaks of stone and metal. The bones of a bonespitter are in constant flux, swimming through its body like fish and occasionally leaping from the body to fall back in with wet slaps.

The transformation into a bonespitter shatters the minds of those consumed by the Chaos Spire, but their new undead bodies are resistant to destruction.