Don't kow if its too late but here is a creature I made years ago before I found this thread. It was used against the PC's and well... They now hate the sewers...
CREATURE OF DARK OOZE
Large Outsider (Owlbear + Half-Black Dragon + Gelatinous +Half-Fiendish + Fiendish)
HD: 5D10+45 (72hp)
Initiative: +1 (Dex)
Speed: 15ft, Fly 30ft (Average)
AC: 18 (-1 Size, +1 Dex, +8 Natural)
Attacks: 2 Claws +16 Melee, Bite +11 Melee, Slam +11
Damage: Claw (1D6+12)+(Acid 1D6), Bite (1D8+6)+(Acid 1D6), Slam (2D4+6)+(Acid 1D6)
Face/Reach: 5ft by 10ft/5ft
SA: Improved Grab, Breath Weapon (Line of Acid), Smite Good
SQ: Scent, Low-Light Vision 60ft, Darkvision 60ft, Immunities, Resistances, DR 3/-, Blindsight 60ft, Resilient, Save & Skill Bonuses, DR 5/+1, SR 10
Saves: Fort +8, Ref +5, Will +2
Abilities: Str 34, Dex 12, Con 29, Int 5, Wis 8, Cha 10
Skills: Listen +11, Spot +12
Feats: Roll With It
Climate/Terrain: The Abyss
Organization: Unique (Gang: Self + 2D10 Gray Oozes)
CR: 11
Treasure: None
Alignment: Chaotic Evil
Advancement: 6-8 HD (Large), 9-15 HD (Huge)
The Creature of Dark Ooze is a vicious near mindless creature that dwells deep in the Abyss surrounded by all manner of foul Oozes. Some believe that the Creature is the son of the Demon Prince Jubilex while others claim he was spawned in some foul pit. Others still don’t care how he came about as long as he stays away…
COMBAT
The Creature has no tactics and simply charges into the fray rending and tearing: seeking fresh meat and food…
Breath Weapon (Su): Line of acid 5ft high, 5ft wide, 60ft long. 6D4 damage Ref DC 17.
Improved Grab (Ex): Can use if hit with both claws.
Save & Skill Bonuses: +4 to Hide, +4 against Sleep, mind influencing and paralysis.
Resilient (Ex): Cannot be flanked, 1D6 less damage from Sneak attack, ½ less
damage from Critical Hit.
Immunities: Poison, Acid, Stun & Polymorph immunities.
Resistances: Cold, Electricity and Fire resistance 20.
Smite Good: Adds +5 to damage of 1 attack per day.
Slaadmaster
'Law...Whats that?'