This enormous worm is covered with mottled blue-and-green plates of chitinous armor. Its giant, tooth-filled mouth is the size of an ox.
N Gargantuan magical beast
Init –2; Senses darkvision 60 ft., tremorsense 60 ft.; Perception +18
AC 26, touch 4, flat-footed 26 (–2 Dex, +22 natural, –4 size)
Melee bite +25 (4d8+12/19–20 plus grab), sting +25 (2d8+12 plus poison)
Space 20 ft.; Reach 15 ft.
Special Attacks swallow whole (4d8+18 bludgeoning damage, AC 21, 20 hp)
Str 35, Dex 6, Con 25, Int 1, Wis 8, Cha 8
Base Atk +16; CMB +32 (+36 grapple); CMD 40 (can't be tripped)
Feats Awesome Blow, Critical Focus, Improved Bull Rush, Improved Critical (bite), Power Attack, Staggering Critical, Weapon Focus (bite, sting)
Skills Perception +18, Swim +20 Poison (Ex) Sting—injury; save Fort DC 25; frequency 1/round for 6 rounds; effect 1d4 Strength damage; cure 3 consecutive saves. The save DC is Constitution-based.
This is a Variant Monster. The full stats were not provided by Paizo so some calculations were made. The DM is encouraged to double-check the numbers before using.