Plague Spewer (CR 10)

Huge Undead
Alignment: Always neutral evil
Initiative: -1 (Dex); Senses: darkvision 60 ft.

AC: 23 (-2 size, -1 Dex, +16 natural), touch 7, flat-footed 23
Hit Dice: 16d12 (104 hp); DR: 10/slashing
Fort +5, Ref +4, Will +11
Speed: 40 ft.
Space: 15 ft./15 ft.
Base Attack +8; Grapple +26
Attack: Slam +16 melee
Full Attack: 2 slams +16 melee
Damage: Slam 1d8+10 plus plague
Special Attacks/Actions: Plague, vomit rat swarm
Abilities: Str 31, Dex 9, Con -, Int -, Wis 12, Cha 16
Special Qualities: undead traits
Feats: -
Skills: -
Advancement: 17-32 HD (Huge); 33-48 HD (Gargantuan)
Climate/Terrain: Underground
Organization: Solitary or pair plus 2d4 rat swarms
Treasure/Possessions: Standard

Source: Monster Manual III

Plague (Su): Supernatural disease-slam, Fortitude DC 21, incubation period 1 minute; damage 2d4 Dex and 2d4 Con. The save DC is Charisma-based. The disease is spread by contact and does not require injury.

Unlike normal diseases, plague continues until the victim reaches Constitution 0 (and dies) or until a remove disease spell or similar magic is applied.

An afflicted creature of Huge size or larger who dies of the plague rises as a plague spewer in 1d4 days.

Vomit Rat Swarm (Su): As a full-round action, a plague spewer can spew forth a rat swarm. It can do this up to four times per day.

Plague spewers hate almost all living creatures and will launch themselves into combat, relentlessly attacking the nearest foe. Plague spewers attack without cunning or guile. They seek to slam and bash living creatures. Periodically, and whenever they cannot easily reach a foe, they vomit forth swarms of rats.

A plague spewer's greatest threat is the devastating disease it carries. Unlike many such ailments, this one spreads merely from contact. Thus, those seeking to help the afflicted often become victims themselves. Plague spewers stand 22 feet tall and weigh 10 tons.