Sand Worm, Greater (CR 7)
This large desert worm is covered with sand-colored plates of chitinous armor. Its trifurcated mouth opens to reveal row upon row of razor sharp teeth.
N Gargantuan magical beast (desert, earth)
Init –1; Senses darkvision 60 ft., low-light visions, tremorsense 60 ft.; Perception +17
AC 23, touch 6, flat-footed 23 (–4 size, +17 natural armor)
hp 127 (10d10+72)
Fort +13, Ref +6, Will +5
DR 5/—; Immune acid, fire, paralysis, and poison
Weaknesses susceptible to cold
Speed 40 ft., burrow 40 ft.
Melee bite +13 (2d8+9/19-20 plus grab)
Space 20 ft., Reach 15 ft.
Special Attacks sand tremor, static charge, swallow whole (5d6 acid damage, AC 20, 25 hp),
The favored tactic of the sandworm is to lurk beneath the surface of the desert sands until it senses a creature moving by with its tremorsense, whereupon it burrows out to surprise and attack its prey (treat this attack as a charge attack). A sandworm that has taken more than half its hit points in damage retreats deep into the sands unless it is cornered, in which case it fights to the death.