Hullathoin (CR 13)

Huge Undead
Alignment: Always neutral evil
Initiative: -1 (Dex); Senses: blindsight 60 ft., scent, Listen +22, and Spot +22

AC: 27 (-2 size, -1 Dex, +20 natural), touch 7, flat-footed 26
Hit Dice: 16d12 (104 hp); DR: 15/magic and silver
Fort +7, Ref +4, Will +13
Speed: 60 ft.
Space: 15 ft./10 ft. (20 ft. with tentacles)
Base Attack +8; Grapple +26
Attack: Bite +17 melee
Full Attack: Bite +17 melee and 2 stamps +14 melee and 2 tentacles +14 melee
Damage: Bite 2d8+10/19-20, stamp 1d8+5, tentacle 1d6+5 plus poison
Special Attacks/Actions: Deform, exude bloodfiend locusts, improved grab, improved grapple, poison, rebuke undead, ring of pus
Abilities: Str 30, Dex 8, Con -, Int 12, Wis 16, Cha 12
Special Qualities: cold immunity, electricity immunity, fast healing 8, fire resistance 15, sonic resistance 13, SR 26, undead traits
Feats: Cleave; Great Fortitude; Improved Critical (bite); Multiattack; Power Attack; Weapon Focus (bite)
Skills: Balance +18, Climb +29, Listen +22, Spot +22, and Swim +29
Advancement: 17-32 HD (Huge); 33-48
Climate/Terrain: Any land or underground
Organization: Solitary
Treasure: Standard

Source: Fiend Folio

With a distinctive preference for the dark places of the land, the hullathoin is most commonly encountered underground. Remote mountain passes, dark bogs, and ancient forests also serve as suitable homes for this undead monstrosity.

Standing 20 feet high at the shoulder, a hullathoin walks on four long, powerful legs. It has a skeletal head with a massive maw. The most distinctive aspect of a hullathoin is that its mottled gray and black body seems to carry some sort of wasting illness. Angry, red, pus-filled sores that pulse and weep cover its flesh. Buzzing insects surround the creature at all times and feast off its rotting body.

A hullathoin is nearly always accompanied by a ragtag mob of assorted undead creatures. Since the swarm it carries in its body is capable of creating fresh vampire spawn, these are the most common kind of undead in its retinue, but because it can command undead, mummies, ghasts, ghouls, zombies, or even mohrgs or spectres might be found in its company.

Hullathoins speak Common and, curiously, Draconic.