Lamia Matriarch

This creature looks like a beautiful human woman from the waist up, but below is the body and tail of an immense snake.
 

Lamia Matriarch (CR 8)

Large Monstrous Humanoid (Shapechanger)
Alignment: Chaotic Evil
Initiative: +4
Senses: Darkvision 60 feet, Low-Light Vision; Perception +3
  Speed: 40 feet, Climb 40 feet, Swim 40 feet
Space: 10 feet
 

Defense

Armor Class: 21, touch 13, flat-footed 17 (+4 Dex, +8 natural, -1 size)
Hit Points: 102 (12d10+36)
Saving Throws: Fort +7, Ref +12, Will +11
Immunity: mind-affecting effects
Spell Resistance: 19
 

Offense

Melee: +1 scimitars +14/+14/+9/+9/+4 (1d6+6/15-20 plus 1 Wisdom drain on first hit each round) or touch +16 (1d4 Wisdom drain)
Reach: 5 feet
  Special Attacks: Wisdom drain
  Spell-Like Abilities (CL 12th; Concentration +17):

Statistics

StrDexConIntWisCha
20 (+5) 19 (+4) 17 (+3) 16 (+3) 16 (+3) 21 (+5)
Base Attack Bonus: +12
CMB +18
CMD 32 (can't be tripped)
  Feats: Extend Spell, Improved Critical (Scimitar), Improved Two-Weapon Fighting, Two-Weapon Fighting, Weapon Focus (Scimitar)
  Skills: Acrobatics +8 (+12 jump), Bluff +21, Climb +13, Diplomacy +11, Disguise +11, Intimidate +20, Knowledge (any one) +15, Knowledge (arcana) +15, Spellcraft +15, Swim +13, Use Magic Device +21 Languages: Abyssal, Common, Draconic
  Special Qualities: Change Shape (fixed Medium humanoid form, alter self ), undersized weapons

 

Special Abilities

Spells

A lamia matriarch casts spells as a 6th-level sorcerer, and can cast spells from the cleric list as well as those normally available to a sorcerer. Cleric spells are considered arcane spells for a lamia matriarch.

Wisdom Drain (Su)

A lamia matriarch drains 1d4 points of Wisdom each time she hits with her melee touch attack. The first time each round that she strikes a foe with a melee weapon, she also drains 1 point of Wisdom. A DC 21 Will save negates the Wisdom drain. Unlike with other kinds of ability drain attacks, a lamia matriarch does not heal damage when she uses her Wisdom drain. The save DC is Charisma-based.
 

Ecology

Environment: Any Land
Organization: solitary, pair, or cult (3-6)
Treasure: double (2 +1 scimitars, other treasure)

  The queens of a race consumed by bitterness and predatory instinct, lamia matriarchs mastermind all manner of foul plots in hopes of breaking the bestial curse that afflicts their race. They move with shocking ease from silken-tongued temptresses to dervishes, striking with all the deadly precision of vipers.
  Quick to covet, enslave, and overindulge, lamia matriarchs luxuriate in gory feasts, violent trysts, and bloody entertainments, reveling until their playthings are broken or until they tire and move on.