Jiki-Ketsu-Gaki (CR 6)

Medium Undead (Spirit)
Alignment: Always chaotic evil
Initiative: +4 (Improved initiative); Senses: Listen +14 and Spot +14
Languages: usually Common

AC: 18 (+8 natural), touch 10, flat-footed 18
Hit Dice: 8d12 (52 hp); DR: 10/honorable
Fort +2, Ref +2, Will +7
Speed: 30 ft., fly 20 ft. (average)
Space: 5 ft./5 ft.
Base Attack +4; Grapple -1
Attack: Bite +6 melee; 2 claws +4 melee
Full Attack: Bite +6 melee; 2 claws +4 melee
Damage: Bite 1d6; claw 1d4+1
Special Attacks/Actions: Attach, blood drain, hypnotism
Abilities: Str 14, Dex 10, Con -, Int 12, Wis 13, Cha 15
Special Qualities: cold and fire immunity, undead, fast healing 5, gaki qualities
Feats: Alertness; Improved Initiative; Multiattack
Skills: Hide +11, Listen +14, Move Silently +11, Perform (string instruments) +13, and Spot +14
Advancement: 9-24 HD (Medium-size)
Climate/Terrain: Any land
Organization: Solitary
Treasure: None

Source: Oriental Adventures

Gaki are minor undead spirits, the spirits of wicked mortals who return to the world of the living in the form of horrible monsters as punishment for their sins.

Jiki-ketsu-gaki are the spirits of corrupted shamans, monks, or other holy individuals who were guilty of heresy in life. They are gaunt humanoids with dark and greasy flesh, sharp yellow fangs clawed hands, and deep-set, bloodshot eyes. They are the most intelligent of all gaki, as well as the most talkative - they normally communicate in normal speech. They feed on humanoid blood.

Spirit Subtype

Spirit creatures include some fey and elementals (nature spirits), outsiders (celestial spirits), undead (ghosts and ancestors), and even dragons. Spirit creatures are nor necessarily incorporeal, despite their name - in the worlds of Oriental Adventures, some spirits are as much flesh and bone as humans are. The only game effect of the spirit type modifier is that spirit creatures are all affected by spells such as commune with greater spirit, invisibility to spirits, and protection from spirits.