Plague Blight (CR 6)

Medium Undead (Evil)
Alignment: Always evil (any)
Initiative: +5 (Dex); Senses: darkvision 60 ft., Listen +13, and Spot +13
Languages: usually Common

AC: 23 (+5 Dex, +8 natural), touch 15, flat-footed 18
Hit Dice: 6d12+6 (45 hp); DR: 5/slashing
Fort +2, Ref +7, Will +7
Speed: 30 ft.
Space: 5 ft./5 ft.
Base Attack +3; Grapple +7
Attack: Slam +7 melee
Full Attack: Slam +7 melee
Damage: Slam 1d6+6 [+2 against good-aligned foes] and gangrenous touch
Special Attacks/Actions: Gangrenous touch
Abilities: Str 19, Dex 21, Con -, Int 14, Wis 14, Cha 15
Special Qualities: gangrenous stench, resistant to blows, undead traits, +2 turn resistance
Feats: Alertness; Cleave; Improved Toughnesst; Power Attack
Skills: Balance +7, Escape Artist +12, Hide +14, Jump +6, Listen +13, Move Silently +14, Spot +13, and Tumble +14
Advancement: 7-12 HD (Medium); 13-18 HD (Large)
Climate/Terrain: Any
Organization: Solitary, pair, or rot (6-10)
Treasure/Possessions: Standard

Source: Libris Mortis

Gangrenous Stench (Ex): Whenever a plague blight desires, it causes its horrible odor of rot to emanate from the folds of its wrappings. All living creatures within 10 feet of the plague blight must make a DC 15 Fortitude save or take 1d6 points of Strength damage and become nauseated. The save DC is Charisma-based.

Gangrenous Touch (Su): Supernatural disease (accelerated) - slam, Fortitude DC 15, incubation period instant; damage 1d4 Con. Unlike normal diseases, gangrenous touch requires a saving throw every round. It visibly progresses over a period of seconds, turning the afflicted area putrescent and gangrenous. The rot continues until the victim makes two successful saving throws in a row, the victim reaches Constitution 0 (and dies), or the victim receives a remove disease spell or similar treatment. Once it is infected or it successfully saves, a creature can't be infected by gangrenous touch again for 24 hours.

The body of a victim claimed by gangrenous touch sloughs into a brittle, stinking mass of putrescent ruin that molders to nothing over the course of 24 hours, unless remove disease is cast on the remains within that time.

Resistant to Blows (Ex): Physical attacks deal only half damage to a plague blight. Apply this effect before damage reduction.

In melee combat, the stench of a plague blight sickens its opponents. Far worse is its couch, which brings on a terrible wasting disease in its victims, rotting the flesh in seconds and sending tendrils of dead flesh ever inward toward the heart.

A plague blight's natural weapons, as well as any weapons it wields, are treated as evil-aligned for purpose of overcoming damage reduction.

Plague blights are animated corpses of humanoids who died from plague or rot. In undeath, they seek to putrefy all that is pure. They are wily and may attempt to trick their victims into allowing themselves get close enough to touch.

Plague blights speak whatever languages they spoke before being claimed by plague, plus Common.

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).