The material below is Open Game Content from a 3PP Source
Barely seen out of the corner of the eye, this wisp of shadow is vaguely humanoid in outline and writhes with unholy life.
Shadow (CR 3, XP 800)
CE Medium undead (incorporeal)
Init +2; Senses darkvision 60 ft.; Perception +8
AC 15, touch 15, flat-footed 12 (+2 deflection, +2 Dex, +1 dodge)
hp 19 (3d8+6)
Fort +3, Ref +3, Will +4
Defensive Abilities incorporeal, channel resistance +2; Immune undead traits
Speed fly 40 ft. (good)
Melee incorporeal touch +4 (1d6 Strength damage)
Special Attacks create spawn
Abl Str —, Dex 14, Con —, Int 6, Wis 12, Cha 15
Base Atk +2; CMB +4; CMD 17
Feats Dodge, Skill Focus (Perception)
Skills Fly +11, Perception +8, Stealth +8 (+12 in dim light, +4 in bright light); Racial Modifiers +4 Stealth in dim light (–4 in bright light)
Organization solitary, pair, gang (3–6), or swarm (7–12)
Create Spawn (Su) A humanoid creature killed by a shadow’s Strength damage becomes a shadow under the control of its killer in 1d4 rounds.
Strength Damage (Su) A shadow’s touch deals 1d6 points of Strength damage to a living creature. This is a negative energy effect. A creature dies if this Strength damage equals or exceeds its actual Strength score.
The sinister shadow skirts the border between the gloom of darkness and the harsh truth of light. The shadow prefers to haunt ruins where civilization has moved on, where it hunts living creatures foolish enough to stumble into its territory. The shadow is an undead horror, and as such has no goals or outwardly visible motivations other than to sap life and vitality from living beings.