Sentry Pudding, Elder* (CR 14)

Gargantuan Ooze
Alignment: Always neutral
Initiative: +2 (-2 Dex, Improved Initiative); Senses: blindsight 60 ft. and Listen +3

AC: 4 (-4 size, -2 Dex), touch 4, flat-footed 4
Hit Dice: 20d10+180 (290 hp)
Fort +15, Ref +4, Will +6; +4 against mind-affecting
Speed: 20 ft., climb 20 ft.
Space: 20 ft./20 ft.
Base Attack +15; Grapple +35
Attack: slam +19 melee (4d6+12 plus 3d6 acid)
Special Attacks/Actions: Constrict
Attack Options: Improved grab, Power Attack
Abilities: Str 26, Dex 7, Con 28, Int 2, Wis 10, Cha 10
Special Qualities: Ooze traits, split, SR 22
Feats: Improved Initiative, Improved Natural Attack (slam), Iron Will, Power Attack, Skill Focus (Hide), Skill Focus (Move Silently), Stealthy
Skills: Climb +16, Hide +5, Listen +3, and Move Silently +9
Advancement: -
Climate/Terrain: Any dungeon
Organization: Solitary
Treasure/Possessions: None

Source: Dungeonscape

The massive pool of inky goo regards you carefully, reacting to your movements.

Acid (Ex): Any melee hit or constrict attack deals 3d6 points of acid damage. Armor and clothing is dissolved (DC 29 Reflex save negates). Wooden or metal weapons striking the elder sentry pudding are dissolved (Reflex DC 29 negates).

Constrict (Ex): An elder sentry pudding deals automatic slam and acid damage on a successful grapple check. The opponent's armor and clothing take a -4 penalty on Reflex saves against the acid.

Split (Ex): Piercing and slashing weapons deal no damage to an elder sentry pudding. Instead, the creature splits into two identical puddings, each with half the original's current hit points (round down). A pudding with 10 or fewer hit points cannot be further split, and the creature dies if reduced to 0 hit points.