Chulcrix (GEP)

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Luckily, these gargantuan hunters of the Deep Ethereal are rare-their size and ferocity are more than a match for most cutters. A chulcrix resembles a gigantic worm 100 to 300 feet long, covered with black, chitinous skin that secretes glistening mucous reeking of rotten meat. Its gaping circular maw is lined with small sensory tendrils, and two 30-foot-long pincered arms extend menacingly into the mist-though it's not with its arms that a chukrix catches its prey.
When the chulcrix flushes potential prey in the Deep, the creature gapes open its 30-foot-wide mouth. From this terrifying maw the culchrix radiates an invisible cylinder of force that draws prey toward it. Swallowed prey usually dies quickly, but if the contents of its stomach become too unruly, it performs an amazing feat: The creature turns itself inside out, instantly plane shifting to another location in the Deep and leaving behind its stomach contents!
If a chukrix is ever drawn across the curtain of vaporous color through either force or deceit, it "beaches" itself on the plane beyond, as the Border doesn't provide sufficient support to contain these monstrosities. Once solid, a chukrix lies helpless and soon perishes. In those planes without gravity (such as the Elemental Plane of Air), a chulcrix remains a threat. However, the creature is unable to reenter the Ethereal Plane without outside aid, though it continues to perform its gut-wrenching transposition at frequent intervals, apparently unable to accept that fact that it has become stranded. (Dragon's Rest, DLA3) 
CHULCRIX: AC {-2}; MV {Fl 18 {BJ}; HD 13; THAC0 7; IIAT 2; Dmg 3d6/3d6 (pincers); SA Attract victims; SD Regeneration, immunities; SZ G (100' long); ML steady (12); Int low (5-7); AL CE; XP 18,000. 
SA-Attract victims: The chulcrix' s maw radiates an invisible cylinder of force 100' long and 25' wide that draws prey toward it. Anyone within the area of effect must successfully save vs. spell or be drawn toward the chulchrix's open mouth at a movement rate of 12. Furthermore, victims who fail a save vs. paralyzation are paralyzed. Those who successfully make the second saving throw can still make missile attacks, cast spells, and even try to move out of the cylinder; however, such efforts only reduce the rate of attraction from 12 to 6. Victims continue to move toward the chulcrix's maw until the chulcrix is killed or driven off by other attacks, or until they are consumed.
Once in the creature's stomach, the paralyzation wears off but victims still suffer 1d4 points of damage per round from acidic digestive gases. Those who attempt to hack themselves free attack with a -2 penalty. If the chulcrix loses more than half its hit points from an internal attack, it plane shifts away, leaving behind its stomach contents.
SD-Regenerates 1d4 hp/round. Immune to normal and magical fire and cold, and all forms of dragon breath.