In battle, a purple worm forms into a coil 15 feet across,
biting and stinging anything within reach.
Improved Grab (Ex): To use this ability, the purple worm must
hit with its bite attack. If it gets a hold, it automatically
deals bite damage and can attempt to swallow the foe.
Swallow Whole (Ex): A purple worm can try to swallow a grabbed
opponent of Large or smaller size by making a successful grapple
check. Once inside, the opponent takes 2d8+12 points of crushing
damage plus 1d8 points of acid damage per round from the
worm's gizzard. A swallowed creature can climb out of the
gizzard with a successful grapple check. This returns it to the
worm's maw, where another successful grapple check is needed
to get free. A swallowed creature can also cut its way out by
using claws or a Small or Tiny slashing weapon to deal 25 points
of damage to the gizzard (AC 20). Once the creature exits,
muscular action closes the hole; another swallowed opponent must
cut its own way out. The worm's interior can hold two Large,
four Small, eight Tiny, sixteen Diminutive, or thirty-two Fine or
Poison (Ex): Sting, Fortitude save (DC 24); initial damage 1d6
temporary Strength, secondary damage 2d6 temporary Strength.
Tremorsense (Ex): A purple worm can automatically sense the
location of anything within 60 feet that is in contact with the