Oni, Ushi-Oni

This immense creature has the leering head of a fanged demonic bull atop a furry, crab-like body. Eight spidery legs tipped with an ivory claw carry it forward, and a tail tipped in a similar appendage lashes behind it. Its entire body pulses and ripples, as if it were barely containing some immense energy.

Source Demiurge113
Originally posted on Probing the Membrane of Science

Ushi-oni are simultaneously among the least and the greatest of the oni. Formed from spirits envious of the freedom and savagery of minotaurs and other monstrous humanoids, ushi-oni are trapped in a rebellious shell of ever-shifting flesh and their intellect is a dull flicker beside that of most other oni. Their strength is, however, legendary, and their metamorphic abilities make them unpredictable and dangerous opponents.

Ushi-oni rarely associate with others of their own kind, but may strike up crude friendships with other powerful aquatic horrors such as scylla, krakens or Nure-onna. These monsters use the ushi-oni as muscle, the ushi-oni gains a more adroit brain to assist it in preying on mortals and gathering treasure, and they both benefit from another pair of eyes to look for either prey or adventurers seeking to stop their depredations.

Ushi-Oni CR 16

XP 76,800 CE Huge outsider (aquatic, native, oni) Init +5; Senses darkvision 60 ft., Perception +24

DEFENSE

AC 32, touch 9, flat-footed 31 (-2 size, +1 Dexterity, +22 natural) hp 235 (18d10+136), regeneration 10 (acid, fire) Fort +19, Ref +9, Will +14 Defensive Abilities shifting anatomy

OFFENSE

Speed 40 ft., Climb 40 ft., Swim 40 ft. Melee bite +27 (2d6+11 plus poison), gore +27 (2d8+11), 5 claws +28 (1d8+11/19-20) Space 15 ft.; Reach 15 ft. Special Attacks breath weapon, powerful charge (gore, 4d8+16), unstable form

STATISTICS

Strength 32, Dexterity 12, Constitution 27, Intelligence 9, Wisdom 17, Charisma 18 Base Atk +18; CMB +31; CMD 42 (54 vs. trip) Feats Critical Focus, Dazzling Display, Improved Critical (claw), Improved Initiative, Intimidating Prowess, Lightning Reflexes, Shatter Defenses, Staggering Critical, Weapon Focus (claw) Skills Climb +40, Intimidate +35, Perception +24, Sense Motive +24, Swim +40 Languages Common SQ amphibious

ECOLOGY

Environment temperate coastlines Organization solitary Treasure standard

SPECIAL ABILITIES

Breath Weapon (Su) 60 ft. cone, Reflex DC 27 half, once every 1d4 rounds, 18d6 fire damage. Creatures that take damage from an ushi-oni’s breath weapon must also make a saving throw against the creature’s poison. The save DC is Constitution based. Poison (Ex) Bite or breath weapon – injury; save Fort DC 27; frequency 1/round for 6 rounds; effect 1d6 Strength; cure 2 saves. The save DC is Constitution based.   Shifting Anatomy (Ex) An ushi-oni has a 75% chance to ignore any bonus damage from a sneak attack or critical hit.   Unstable Form (Su) As a move action, an ushi-oni can reshape its body to grant itself one of the following abilities. The ability lasts for 1 minute or until the ushi-oni spends another move action to change it.   Rip and tear – the ushi-oni gains the grab (claw) and rake (4 claws, +28, 1d8+11) universal monster abilities   Flight – the ushi-oni gains a Fly speed of 80 feet with good maneuverability   Armor plating – the ushi-oni gains a +4 enhancement bonus to its natural armor and DR 5/- Reach – the ushi-oni’s reach increases by 5 ft for all of its attacks.   Quills – the ushi-oni gains the ability to fire up to four quills as a ranged attack as a standard action (+17, 1d10+11), and any creature that strikes an ushi-oni with a natural weapon, touch attack or melee weapon takes 1d10+11 damage. Melee weapons with reach do not endanger their wielder in this way. Trample -the ushi-oni gains the trample universal monster ability (1d8+16, DC 30)