Puppeteer (CR 1)

Fine Vermin
Alignment: Usually lawful evil
Initiative: +4 (Dex); Senses: blindsight, Listen +7, and Spot +7

AC: 22 (+8 size, +4 Dex), touch 22, flat-footed 18
Hit Dice: 1/16d8 (1 hp)
Fort +2, Ref +4, Will +3
Speed: 5 ft.
Space: 1/2 ft./0 ft.
Base Attack +0; Grapple -21
Attack: Bite +3 melee
Full Attack: Bite +3 melee
Damage: Bite 1d2-5
Special Attacks/Actions: Psionics, thrall
Abilities: Str 1, Dex 19, Con 11, Int 18, Wis 16, Cha 14
Special Qualities: psionics, host protection
Feats: Psychic Bastion
Skills: Hide +24, Listen +7, and Spot +7
Advancement: -
Climate/Terrain: Any land and underground
Organization: Solitary or pack (2-8)
Treasure: None

Source: Psionics Handbook

Puppeteers are psionic parasites that vicariously experience the lives of their victims by taking control of their minds.

A puppeteer resembles a 4-inch-long, dark brown leech with no definable anatomy or sense organs. Once one establishes control over a victim (now called a host), it attaches to the host's skin in a spot hidden by fur, hair, or clothing. It draws nutrients from the host's blood, but since it is so small, its requirements are minimal. Only when twenty or more puppeteers ride a single host - a rare occurrence - is there direct risk to the host's health.

Puppeteers seek to secretly infect the societies of other creatures and take control of them so as to have a continuous supply of bodies. They do not speak except when directing a host body to do so.