Bloodhulk Fighter (CR 4)

Medium Undead
Alignment: Always neutral evil
Initiative: -1(Dex); Senses: darkvision 60 ft., low-light vision, Listen +0, and Spot +0
Languages: understands creator's orders

AC: 11 (-1 Dex, +2 natural), touch 9, flat-footed 12
Hit Dice: 10d12+75 (140 hp)
Fort +3, Ref +2, Will +7
Speed: 20 ft.
Space: 5 ft./5 ft.
Base Attack +5; Grapple +8
Attack: Melee: slam +8 (1d8+4)
Special Attacks/Actions:
Abilities: Str 16, Dex 9, Con -, Int -, Wis 10, Cha 1
Special Abilities: Immune: undead immunities; Weakness: fragile
Special Qualities: blood bloated, undead traits
Skills: Listen +0 and Spot +0
Advancement: Mindless undead
Climate/Terrain: Any
Organization: Solitary or small group
Treasure/Possessions: None

Source: Monster Manual IV

Fragile (Ex): A bloodhulk fighter takes an extra 1d6 points of damage whenever it takes at least 1 point of damage from a piercing or slashing weapon.

Blood Bloated (Ex): A bloodhulk fighter always gains the maximum hit points possible per Hit Die. In addition, it gains 2 bonus hit points per Hit Die.