Ooze: Terrestrial effluvium has the traits and immunities common to oozes.
Acidic Enzymes (Ex): Any creature that takes damage from a terrestrial effluvium’s slam attack also takes 1d6 points of acid damage from the ooze’s digestive enzymes. The enzymes continue to dissolve the victim, dealing 1d6 points of acid damage every round until the wound is washed with at least 1 pint of water (or some other appropriate liquid).
Immunities (Ex): Terrestial effluvium is immune to ballistic and piercing weapons.
Terrestrial Effluvium: CR 15; Colossal ooze; HD 32d10+256 plus 40 (extra hit points); hp 472; Mas —; Init –2; Spd 10 ft.; Defense 6, touch 0, flat-footed 6 (–8 size, –2 Dex, +6 natural); BAB +24; Grap +53; Atk +37 melee (2d8+19 plus 1d6 acid, slam); Full Atk +37/+32/+27/+22 melee (2d8+19 plus 1d6 acid, slam); FS 30 ft. by 30 ft.; Reach 15 ft.; SQ ooze, acidic enzymes, immunities, vulnerabilities, blindsight 60 ft.; AL none; SV Fort +18, Ref +8, Will +5; AP 0; Rep +0; Str 44, Dex 6, Con 26, Int —, Wis 1, Cha 1.
Advancement: 33–56 HD (Colossal).