Eryops

A powerful crocodilian creature bursts from the muddy water, grabbing your halfling friend right before your eyes. In a flash he and the beast are gone into the gloom again.

From the Permian period, these carnivores spent a bit more time out on dry land then their fellows did. They are thick bodied and their mouths are large and full  of teeth.

Heavyset amphibians that dwell in the waters of various tropical regions, eryops are usually piscivores but will eat other things if the opportunity. They will on occasion group together to bask on the banks of their home.

Originally Posted by Raptorial of the Wizards Community forums.

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Eryops (Bigmouth)
Large animal
Hit Dice	3d8+24 (37 hp)
Initiative	+3 (+3 Dexterity)
Speed	10 ft. (2 squares), Swim 30 ft. (6 squares)
Armor Class	14 (-1 size, +3 Dexterity, +2 natural), touch 12, flat-footed 11
Base Attack/Grapple	+2/+14
Attack	Bite +9 melee (1d8 +8)
Full Attack	Bite +9 melee (1d8 +8) and tail +4 melee (1d6 +4)
Space/Reach	10 ft./5 ft.
Special Attacks	Improved grab, swallow whole
Special Qualities	Hold breath, Low-Light Vision
Saves	Fort +12, Ref +6, Will +1
Abilities	Strength 27, Dexterity 16, Constitution 25, Intelligence 2, Wisdom 10, Charisma 8
Skills	Hide +3, Listen +1, Spot +1, Swim +8
Feats	Great Fortitude,Toughness
Environment	Warm marshes, rivers, lakes, or swamps
Organization	Solitary or basking column (3-11)
Challenge Rating	3
Treasure	None
Alignment	Always neutral
Advancement	4-6 HD (Large); 7-9 HD (Huge)
Level Adjustment	–

Combat

Eryops battle similar to crocodiles.

Improved Grab (Ex) If an eryops hits with its bite, it deals normal damage and attempts to start a grapple as a free action without provoking an attack of opportunity. No initial touch attack is required. Improved grab only works against creatures size Medium or smaller. The eryops has the option to conduct the grapple normally, or simply use the part of its bite to hold the opponent. If it chooses to do the latter, it takes a -20 penalty on grapple checks, but is not considered grappled itself; the eryops does not lose its Dexterity bonus to AC, still threatens an area, and can use its remaining attacks against other opponents. Each successful grapple check it makes during successive rounds automatically deals the damage indicated for the attack that established the hold. This act does not provoke attacks of opportunity. It can even move (possibly carrying away the opponent), provided it can drag the opponent’s weight.

Swallow Whole (Ex) If an eryops begins its turn with an opponent held in its mouth (see Improved Grab), it can attempt a new grapple check (as though attempting to pin the opponent). If it succeeds, it swallows its prey, and the opponent takes bite damage. The eryops’ smaller throat capacity means that unlike most swallowers, it can only swallow whole a creature size Small or smaller. A swallowed creature is considered to be grappled, while the creature that did the swallowing is not. Each round a swallowed creature gets 1d6 points of acid damage dealt to it from the eryops’ powerful digestive enzymes. A swallowed creature can try to cut its way free with any light slashing or piercing weapon (the amount of cutting damage required to get free is 20 HP, eryops have strong stomach linings), or it can just try to escape the grapple. The Armor Class of the interior of an eryops is 10 + 1/2 its natural armor bonus, with no modifiers for size or Dexterity. If the swallowed creature escapes the grapple, success puts it back in the attacker’s mouth, where it may be bitten or swallowed again.

Hold Breath (Ex) An eryops may hold its breath for 1 hour + and number of minutes as the eryops’ Constitution bonus.