Shikki-Gaki (CR 4)

Medium Undead (Spirit)
Alignment: Always chaotic evil
Initiative: +4 (Improved initiative); Senses: Listen +5 and Spot +5
Languages: usually Common

AC: 16 (+6 natural), touch 10, flat-footed 16
Hit Dice: 5d12 (32 hp); DR: 5/honorable
Fort +1, Ref +1, Will +4
Speed: 30 ft., fly 20 ft. (average)
Space: 5 ft./5 ft.
Base Attack +2; Grapple -3
Attack: 2 claws +3 melee
Full Attack: 2 claws +3 melee
Damage: Claw 1d4+1 plus disease
Special Attacks/Actions: Disease
Abilities: Str 12, Dex 10, Con -, Int 6, Wis 11, Cha 10
Special Qualities: undead, fast healing 3, gaki qualities, mushroom form
Feats: Alertness; Improved Initiative
Skills: Hide +3, Listen +5, Move Silently +4, Search +1, and Spot +5
Advancement: 6-15 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.

Most shikki-gaki are the corrupted spirits of irresponsible healers or negligent servants. A few were once Small nature spirits that inhabited mushrooms or other fungi sprouting from the trunks of decaying trees. These nature spirits completely succumbed to their evil aspects, developing a taste for bluebirds or butterflies.

A shikki-gaki is a bony humanoid with pitted and decayed skin, the ghoulish facial features of a jiki-niku-gaki, and blunt, rotted teeth.

All gaki speak the languages they knew in life (at least Common). With the exception of the jiki-ketsu-gaki, however, they generally communicate only in grunts and moans.

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.