Brain in a Jar (CR 4)

Tiny Undead
Alignment: Usually neutral evil
Initiative: +2 (Dex); Senses: blindsight 60 ft., darkvision 60 ft., Listen +9, and Spot +9
Languages: telepathy 100 ft.

AC: 13 (+2 Dex, +1 deflection), touch 13, flat-footed 11
Hit Dice: 3d12 (19 hp)
Fort +1, Ref +3, Will +6
Speed: Fly 30 ft.(good)
Space: 1 ft./-
Base Attack -; Grapple -
Damage: -
Special Attacks/Actions: Mind thrust, psionics, rebuke undead 6/day (+5, 2d6+6, 3rd)
Abilities: Str -, Dex 14, Con -, Int 16, Wis 12, Cha 16
Special Qualities: madness, undead traits, +4 turn resistance
Feats: Alertness; Iron Will
Skills: Bluff +9, Diplomacy +9, Knowledge (history) +9, Knowledge (psionics) +9, Knowledge (religion) +9, Listen +9, and Spot +9
Advancement: 4-9 HD (Tiny)
Climate/Terrain: Any
Organization: Solitary
Treasure: None

Source: Libris Mortis

Something gray and shriveled sloshes within a grimy glass canister - a disembodied brain afloat in alchemical preservatives.

The brain in a jar is a masterpiece of preservation - but where alchemical preservatives leave off, necromancy picks up. An animate brain in a jar is, in truth, an undead creature. Additionally, possibly because it is free of the need to worry about controlling and animating an entire body, a brain in a jar possesses potent mental powers.

Of course, merely removing the brain of a zombie or some other undead creature and storing it in alchemical preservatives is not enough to create an undead brain with psionic ability. The ritual of extraction, the spells of formulation, and the alchemical recipes of preservation are closely guarded secrets held by only a few master necromancers.

The creation of a brain in a jar is difficult and fraught with danger, because once its mental powers are fully developed, this undead creature is adept at controlling the thoughts and minds of other creatures, especially living creatures. It is not unknown for a brain in a jar to take control over the necromancer who created it.

A brain in a jar weighs about 25 pounds, which includes the weight of the glass canister and the preservative fluids.

A brain in a jar can speak telepathically to any creature within 100 feet that has a language.