Monstrous Scorpion, Gargantuan (CR 10)

Gargantuan Vermin
Alignment: Always Neutral
Initiative: +0; Senses: darkvision 60 ft., tremorsense 60 ft., and Spot +4

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AC: 24 (-4 size, +18 natural), touch 6, flat-footed 24
Hit Dice: 20d8+60 (150 hp)
Fort +14, Ref +6, Will +6

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Speed: 50 ft.
Space: 20 ft./15 ft.
Base Attack +15; Grapple +37
Attack: Claw +21 melee
Full Attack: 2 claws +21 melee and sting +16 melee
Damage: Claw 2d6+10, sting 2d6+5 and poison
Special Attacks/Actions: Improved grab, constrict 2d6+10, poison

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Abilities: Str 31, Dex 10, Con 16, Int -, Wis 10, Cha 2
Special Qualities: Vermin
Feats:
Skills: Climb +14, Hide -8, and Spot +4
Advancement: 21-39 HD (Large)

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Climate/Terrain: Warm desert
Organization: Solitary or colony (2-5)
Treasure/Possessions: None

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Source: Monster Manual

Improved Grab (Ex): To use this ability, the monstrous scorpion must hit with its claw attack. If it gets a hold, it hangs on and stings.

Squeeze (Ex): A monstrous scorpion that gets a hold on an opponent of its size or smaller automatically deals damage with both claws, biting and stinging at its full attack value.

Poison (Ex): Fortitude save DC 36, initial and secondary damage 2d6 Strength.

Skills: A monstrous scorpion receives a +4 racial bonus to Climb, Ride, and Spot checks.

Monstrous scorpions are likely to attack any creature that approaches, and they usually charge prey.

Monstrous scorpions are vicious predators that make unnerving scuttling noises as they speed across dungeon floors. A gargantuan monstrous scorpion has a low, flat body: 40 feet long, 20 feet wide* and 5 feet high**.
*The number includes the scorpion's body and its legs; the actual body width is about a third of the total.
**The number indicates the height of the creature's body; the creature's stinger usually is held about as high off the ground as the creature is wide.