Advanced Swamp Tyrant

Advanced Swamp Tyrant

CR 13                                                                                                            XP: 25,600
N Gargantuan aberration (aquatic)
Init +0; Senses darkvision 60 ft.; Perception +28
AC 21, touch 6, flat-footed 21 (-4 size, +15 natural)
HP 275 (19d12+152); fast healing 6
Fort +13, Ref +8, Will +11
Speed 20 ft., swim 40 ft.
Melee bite +21 (3d8+11), 4 tentacles +21 (2d6+11 plus grab); Reach 40 ft. with tentacles
Space 20 ft.
Special Attacks constrict (2d6+11), swallow whole (2d6+11 crushing plus 1d8 acid, AC 17, 23 hp)
During Combat Swamp tyrants lurk beneath the surface of the swamp. They are often taken as simple piles of vegetation or debris. From hiding, tyrants attack with their tentacles, trying to drag prey to their gaping maws, attempting to swallow their foes whole.
Str 32, Dex 11, Con 24, Int 8, Wis 10, Cha 10
Base Atk +14; CMB +29; CMD 39
Feats Cleave, Great Cleave, Improved Bull Rush, Improved Overrun, Lightning Reflexes, Power Attack, Skill Focus (perception, stealth, survival), Toughness
Skills Linguistics +0, Perception +28, Stealth +16, Survival +27, Swim +19
Languages  Aklo, Common
Treasure Buried beneath the bulk of the swamp tyrant is a hollow
log capped with mud that holds 5,000 gp and a scattering of 16
spinels worth 50 gp each, that can be found by dredging the shallow
pool’s bottom and making a DC 23 Perception check.
Improved Grab (Ex) To use this ability, the tyrant must hit an opponent of up to Large size with a tentacle attack. If it succeeds, the tyrant inflicts bite damage automatically, then it can constrict or attempt to swallow its opponent whole.
Constrict (Ex) A swamp tyrant deals automatic tentacle damage with a successful grapple check against Large or smaller creatures.
Swallow Whole (Ex) A swamp tyrant can try to swallow a grabbed opponent of Large or smaller size by making a successful grapple check Once swallowed, the tyrant's opponent takes 1d8+7 points of crushing damage plus 1d8 points of acid damage each round. A swallowed creature can climb out of the tyrant's gizzard with a successful grapple check. Doing so returns it to the tyrant's maw, where a sceond grapple check is required to get free. A swallowed creature can also cut its way out using claws or a Small or Tiny slashing weapon to deal 25 points of damage to the tyrant's insides (AC 18). Subquently swallowed victims must cut their own way out. A single tyrant can hold one Large, two Medium, three Small, six Tiny, 12 Diminutive or 24 Fine or smaller creatures.
Only a further one in 100 swamplings survives to become a true swamp tyrant, and these beasts are terrifying indeed. Towering 20-30 feet high, their mouths large enough to swallow a horse whole, supported by a network of thick, ropy tentacles, swamp tyrants are predators with few equals. A fully grown tryant's only weakness is its relative size and clumsiness, but its deadly attacks easily make up for these deficiencies.
Creature Collection II: Dark Menagerie 184