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This immense mound of black slime thunders forward, eyes and mouths and even stranger things forming in its heaving bulk.
CR 19
XP 204,800
CN Huge ooze (aquatic)
Init +11; Senses all-around vision, darkvision 120 ft., low-light vision, scent, tremorsense 60 ft.; Perception +33
AC 33, touch 15, flat-footed 26 (+7 Dex, +18 natural, –2 size)
hp 333 (23d8+230); fast healing 10
Fort +19, Ref +14, Will +15
DR 10/—; Immune blindness, charm effects, cold, deafness, ooze traits, sonic; Resist acid 20, electricity 20, fire 20; SR 30
Speed 50 ft., climb 30 ft., swim 50 ft.
Melee 4 slams +30 (3d6+15/19–20 plus grab)
Space 15 ft.; Reach 30 ft.
Special Attacks constrict (3d6+15), maddening cacophony, engulf (4d6+22 bludgeoning damage plus 8d6 acid damage, AC 19, hp 33), trample (4d8+15, DC 36)
Str 40, Dex 24, Con 31, Int 5, Wis 22, Cha 13
Base Atk +17; CMB +34 (+39 grapple); CMD 51 (cannot be tripped)
Feats Blind-Fight, Cleave, Combat Reflexes, Critical Focus, Great Cleave, Great Fortitude, Improved Critical (slam), Improved Initiative, Improved Sunder, Iron Will, Power Attack, Staggering Critical
Skills Climb +23, Perception +33, Swim +23; Racial Modifiers +4 Perception
Languages Aklo
SQ amphibious

All-Around Vision (Ex)

A shoggoth's many sense organs grant a +4 racial bonus on Perception and immunity to flanking.

Maddening Cacophony (Su)

As a free action, a shoggoth can give voice to sounds and words sane life was not meant to hear. All creatures in a 60-foot radius must make a DC 22 Will save or be confused for 1d6 rounds. Each round a creature is affected it takes 1d6 points of Wisdom damage. A creature that saves cannot be affected by this shoggoth's maddening cacophony for 24 hours. This is a sonic mind-affecting effect. The save DC is Charisma-based.

Engulf (Ex)

To use this ability, the shoggoth must begin its turn grappling a creature or must trample. A shoggoth may attempt to engulf as many creatures as it grapples or tramples in a round. This ability otherwise functions as swallow whole, save that a creature that cuts is way out of a shoggoth leaves no hole in the protoplasmic creature's body.