Scorpion, Mindkiller (CR 18)

Huge Undead
Alignment: Always neutral evil
Initiative: +4 (Improved Initiative); Senses: darkvision 60 ft., tremorsense 120 ft., Listen +1, and Spot +40

AC: 40 (-2 size, +32 natural), touch 8, flat-footed 40
Hit Dice: 32d12 (208 hp); DR: 15/good and silver
Fort +12, Ref +12, Will +21
Speed: 40 ft., climb 40 ft.
Space: 15 ft./15 ft.
Base Attack +16; Grapple +43
Attack: 2 claws +28 melee and 3 stings +26
Full Attack: 2 claws +28 melee and 3 stings +26
Damage: Claw 3d6+24/19-20; sting 1d10+9/19-20 plus poison
Special Attacks/Actions: Mindkilling aura (30 feet, DC 30 negates), constrict 3d6+19
Abilities: Str 48, Dex 10, Con -, Int 2, Wis 12, Cha 18
Special Qualities: fast healing 10; undead traits, obey the wormtouched
Feats: Ability Focus (poison); Cleave; Great Cleave; Great Fortitude; Improved Initiative; Improved Critical (claw; sting); Iron Will; Lightning Reflexes; Multiattack; Power Attack
Skills: Climb +31, Hide -4, Listen +1, and Spot +40
Advancement: 33-36 HD (Huge), 37-60 HD (Gargantuan), 61-96 HD (Colossal)
Climate/Terrain: Wormcrawl Fissure
Organization: Solitary, pair, or brood (3-6)
Treasure: None

Source: Dungeon #134

This hideous scorpion is a nasty, black, twenty-foot-long menace. Its chitinous armor is a tangle of cruel hooked spikes and cracks that leaks ichor. It has three scorpion tails instead of one, and the tips of each tail sport several long, green crystalline stingers and plates, looking like some sort of dangerous fanged flower.