Acid Otyugh (Acid Creature)
This three-legged freak is mostly mouth. Three tentacles, two tipped with barbs and one with eyes, extend from its sides. Its hold body oozes corrosive acid.

Acid Otyugh (CR 6; XP 2,400)
N Large outsider (elemental, extraplanar)
Init +0; Senses all-around vision, darkvision 60 ft., low-light vision; Perception +14
AC 17, touch 9, flat-footed 17
(+8 natural, -1 size)
hp 45 (6d10+12)
Fort +7, Ref +5, Will +3
Immune acid, disease, elemental traits
Vulnerable water
Speed 30 ft.
Melee bite +11 (1d8+6 plus disease plus 2d8 acid), 2 tentacles +7 (1d6+3 plus grab plus 2d8 acid)
Space 10 ft.; Reach 10 ft. (15 ft. with tentacle)
Special Attacks constrict (tentacle, 1d6+3 plus 2d8 acid), engulf (R-DC 19, 2d8 acid)
Str 22, Dex 10, Con 15, Int 9, Wis 13, Cha 6
Base Atk +6; CMB +11 (+15 grapple); CMD 21 (23 vs. trip)
Feats Ability Focus (disease), Stealthy, Weapon Focus (tentacle)
Skills Escape Artist +2, Perception +14, Stealth -2 (+6 in lair); Racial Modifier +4 Perception, +8 Stealth in lair, Swim is a class skill
Languages Common, (or Femanx)
Environment underground, urban
Organization solitary, pair, or cluster (3–4)
Treasure standard
Special Abilities
Acid Pool (Ex) An acid otyugh is surrounded at all times by a pool of acid with a spread radius of 20 ft. Any creature that comes in contact with this pool suffers 1d8 points of acid damage.
Acidic Body (Ex) An acid otyugh’s touch corrodes any material it touches except stone. For each round it maintains its touch to an object the acid otyugh deals 2d8 points of acid damage to it.
Disease (Ex) Filth fever: Bite—injury; save Fortitude DC 16; onset 1d3 days; frequency 1/day; effect 1d3 Dex damage and 1d3 Con damage; cure 2 consecutive saves. The save DC is Constitution-based; the diseases carried by otyughs are modified by their unique and magical physiology so the DCs are calculated and do not use standard values.
Water Vulnerability (Ex) For every gallon of freshwater an acid otyugh is exposed to, it takes 1d6 points of damage. If it is submerged in water, the damage increases to 1d8 per round it is submerged. An acid otyugh cannot heal this damage until is it no longer exposed to water.