Quth-Maren (CR 7)

Medium Undead
Alignment: Always chaotic evil
Initiative: +1 (Dex); Senses: Listen +14 and Spot +14

AC: 14 (+1 Dex, +3 natural) touch 11, flat-footed 13
Hit Dice: 10d12 (65 hp)
Fort +3, Ref +4, Will +9
Speed: 30 ft.
Space: 5 ft./5 ft.
Base Attack +5; Grapple +8
Attack: Slam +9 melee
Full Attack: 2 slams +9 melee
Damage: Slam 1d6+3 plus 1d6 acid
Special Attacks/Actions: Caustic blood, command undead, horrifying gaze, spit blood
Abilities: Str 16, Dex 13, Con -, Int 13, Wis 14, Cha 15
Special Qualities: Acid immunity, electricity resistance 15, fast healing 4, fire resistance 15, turn resistance +2, undead traits
Feats: Alertness; Blind-fight; Power Attack; Weapon Focus (slam)
Skills: Climb +16, Hide +14, Listen +14, Move Silently +18, Search +8, and Spot +14
Advancement: -
Climate/Terrain: Underground
Organization: Solitary, pair, or gang (3-6)
Treasure: -

Source: Fiend Folio

A quth-maren is a revolting undead creature created by clerics of Kiaransalee. These clerics are fond of flaying their enemies - removing every scrap of skin - and then animating them in this hideous form.

A quth-maren appears in the overall form it had in life, but it has no skin or exposed fat - just muscles over its skeleton. Caustic blood constantly oozes from its body. Unlike zombies, to which they bear a certain resemblance, quth-marens are neither mindless nor prone to decomposition.