Bisan (CR 5)
AC: 20 (+2 Dex, +8 natural), touch 12, flat-footed 18
Hit Dice: 10d6 (35 hp); DR: 5/cold iron
Fort +3, Ref +9, Will +9
Speed: 60 ft.
Space: 5 ft./5 ft.
Base Attack +5; Grapple +0
Attack: Touch +7 melee touch
Full Attack: Touch +7 melee touch
Damage: Touch 1d10
Special Attacks/Actions: Spell-like abilities
Abilities: Str 11, Dex 14, Con 10, Int 13, Wis 15, Cha 16
Special Qualities: Symbiosis, SR 21
Feats: Alertness; Dodge; Improved Initiative; Weapon Finesse
Skills: Hide +15, Knowledge (spirits) +14, Knowledge(arcana) +14, Listen +17, Move Silently +15, Spot +17, and Survival +15
Advancement: 11-30 HD (Medium-size)
Climate/Terrain: Temperate and warm forest
Spell-like Abilities: At will - animate wood, bane, bless, alter emotions, castigate, elemental ward, ethereal jaunt (self plus 50 pounds of objects only), hold monster, invisibility, iron-wood, plant growth, polymorph self, wood shape. These abilities are as the spells cast by a 10th-level sorcerer (save DC 13 + spell level).
Symbiosis (Su): A bisan's life force is tied to a single tree in the forest where it dwells. If the tree is destroyed (chopped down, burned, or rotted with magic), the bisan dies immediately.
Highly intelligent and clever, a bisan can be a formidable enemy when angered, particularly if someone threatens her personal tree. In general, however, these spirits try to avoid combat, and prefer to use their spells to cause mischief and grief. If forced to fight, a bisan typically flees at the first opportunity, unless she is defending her tree.
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.