Undead, Alchemical (CR 6)

Medium Undead
Alignment: Usually neutral evil
Initiative: +5 (+1 Dex, +4 Improved Initiative); Senses: darkvision 60 ft., Listen +9, and Spot +9
Languages: Common

AC: 19(+1 Dex, +8 natural), touch 11, flat-footed 18
Hit Dice: 9d12+3 (61 hp); DR: 5/magic
Fort +3, Ref +4, Will +7
Speed: 30 ft.
Space: 5 ft./5 ft.
Base Attack +4; Grapple +9
Attack: 2 claws +9 melee
Damage: Melee 2 claws 1d8+5 plus 1d6 alchemical
Special Attacks/Actions: Power Attack, alchemical claws, alchemical breath
Abilities: Str 21, Dex 12, Con -, Int 9, Wis 12, Cha 14
Special Qualities: undead traits, deathburst
Feats: Alertness, Improved Initiative, Power Attack, Toughness
Skills: Climb +17, Jump +17, Listen +9, and Spot +9
Advancement: 10-18 HD (Medium)
Climate/Terrain: Any land and underground
Organization: Solitary
Treasure: None

Source: Dragon #350

Green vapor pours from the open sores covering the flesh of the dead thing that stumbles toward you. Its body is horribly deformed and burned by the chemicals that drip from its sagging frame.

Many foul alchemists and arcanists find it convenient to dump their waste in out-of-the-way and infrequently visited places, such as local cemeteries. These vile soups of failed experiments and magical byproducts sometimes mix with the bodies interred nearby, creating a foul creature known as an alchemical undead.