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
XP 4,800
CE Large monstrous humanoid (shapechanger)
Init +4; Senses darkvision 60 ft., low-light vision; Perception +3
Defense
AC 21, touch 13, flat-footed 17 (+4 Dex, +8 natural, –1 size)
hp 102 (12d10+36)
Fort +7, Ref +12, Will +11
Immune mind-affecting effects; SR 19
Offense
Speed 40 ft., climb 40 ft., swim 40 ft.
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)
Space 10 ft.; Reach 5 ft.
Special Attacks Wisdom drain
Spell-Like Abilities (CL 12th; concentration +17)
At will—charm monster (DC 19), ventriloquism (DC 16)
3/day—deep slumber (DC 18), dream, major image (DC 18), mirror image, suggestion (DC 18)
Spells Known (CL 6th; concentration +11)
3rd (4/day)—haste
2nd (6/day)—death knell (DC 17), invisibility
1st (8/day)—cure light wounds, divine favor, mage armor, magic missile
0 (at will)—dancing lights, daze (DC 13), detect magic, ghost sound (DC 13), mage hand, mending, prestidigitation
Statistics
Str 20, Dex 19, Con 17, Int 16, Wis 16, Cha 21
Base Atk +12; CMB +18; CMD 32 (can't be tripped)
Feats Double Slice, 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; Racial Modifiers +4 Bluff, +4 Use Magic Device
Languages Abyssal, Common, Draconic
SQ change shape (fixed Medium humanoid form, alter self), undersized weapons
Ecology
Environment any land
Organization solitary, pair, or cult (3–6)
Treasure double (two +1 scimitars, other treasure)
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.
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.