XP 4,800
N Gargantuan animal
Init +1; Senses low-light vision, darkvision 60 ft.; Perception +14

AC 20, touch 8, flat-footed 18 (+1 Dex, +1 dodge, +12 natural, –4 size)
hp 105 (10d8+60)
Fort +15, Ref +8, Will +4

Speed 20 ft., swim 50 ft.
Melee bite +15 (2d8+18 plus grab)
Space 15 ft.; Reach 15 ft.
Special Attacks swallow whole (2d6+12 bludgeoning, AC 16, hp 10)

Str 34, Dex 13, Con 22, Int 2, Wis 13, Cha 9
Base Atk +7; CMB +23 (+27 grapple); CMD 35 (39 vs. trip)
Feats Dodge, Cleave, Great Fortitude, Mobility, Power Attack
Skills Perception +14, Swim +20; Racial Modifiers +8 Swim

When a Tylosarus begins its turn with an opponent grappled in its mouth (see Grab), it can attempt a new combat maneuver check (as though attempting to pin the opponent). If it succeeds, it swallows its prey, and the opponent takes bludgeoning damage (2d6+12).  A swallowed creature can escape by doing 9 points of damage to the inside of the Tylosarus with a light slashing or piercing weapon (AC 16). A creature that escapes the pin while swallowed whole emerges from the Tylosarus’s stomach, not its throat, where it may be grabbed and pinned again.

Starting Statistics: Size Medium; Speed 20 ft., swim 50 ft.; AC +3 natural armor; Attack bite (1d6); Ability Scores Str 10, Dex 17, Con 10, Int 2, Wis 13, Cha 9; Special Qualities low-light vision, scent.

7th-level Advancement: Size Large; AC +2 natural armor; Attack bite (1d8 plus grab); Ability Scores Str +8, Dex –2, Con +4.