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Gigas Clam

This monstrous clam's conjoined shells open wide enough to swallow a horse. Inside, two tubular siphons flank the thing's innards, which resemble a fleshy, vaguely humanoid woman, save that instead of a face, it has a singular massive maw filled with rows of ravenous teeth.

Gigas Clam CR 11

XP 12,800
CN Huge magical beast (aquatic)
Init +0; Senses darkvision 60 ft., low-light vision; Perception +13

DEFENSE

AC 26, touch 8, flat-footed 26 (+18 natural, –2 size)
hp 149 (13d10+78)
Fort +14, Ref +10, Will +8
DR 10/magic and slashing; Immune disease, poison

OFFENSE

Speed 20 ft., swim 60 ft.; jet (300 ft.)
Melee bite +20 (2d6+9/19–20), 2 slams +20 (1d8+9 plus grab)
Ranged siphon dart +11 (2d6+9/19–20 plus poison)
Space 15 ft.; Reach 15 ft.
Special Attacks devastating bite, siphon jet, swallow whole (4d8 acid damage, AC 19, 28 hp), trample (1d8+13, DC 22)

STATISTICS

Str 28, Dex 10, Con 23, Int 7, Wis 18, Cha 11
Base Atk +13; CMB +24 (+28 grapple); CMD 34 (can't be tripped)
Feats Combat Reflexes, Improved Critical (siphon dart), Improved Lightning Reflexes, Lightning Reflexes, Point-Blank Shot, Precise Shot, Vital Strike
Skills Perception +13, Swim +27
Languages Aquan

SPECIAL ABILITIES

Devastating Bite (Ex)

A gigas clam's bite attack threatens a critical hit on a roll of 19 or 20.

Poison (Ex)

Siphon dart—injury; save Fort DC 24; frequency 1/round for 6 rounds; effect 1d6 Str damage and paralysis; cure 2 consecutive saves.

Siphon Dart (Ex)

A gigas clam constantly rolls collected sediment and calcifications into needle-like darts it can eject through its siphons. A gigas clam can fire one of these darts as a standard action at a maximum range of 100 feet with no range increment, dealing an amount of damage equal to 2d6 plus its Strength modifier, and possibly poisoning the target.

Siphon Jet (Ex)

As a full-round action, a gigas clam can use its powerful siphon to move a creature or object at least one size smaller up to 20 feet directly away from itself or directly toward itself in a straight line. A creature trapped in this stream of water can avoid the push or pull with a DC 22 Reflex save. A gigas clam can also use this jet to propel itself up to five times its swim speed in a straight line, and can use its trample attack in conjunction with this increased movement. If at any point during this movement the gigas clam comes in contact with a solid object (such as a ship's hull), it deals 4d8 points of damage as it rams the object with its durable shell. The save DC is Constitution-based.