Better Sea Monsters

This was one of the more difficult sections to write up. I haven't used many sea monsters in my own game. I expect to make more than a few changes to these before I publish the final PDF. Any feedback would be much appreciated.

Monster Type	Number Appearing	Armor Class	Move in Inches	Hit Dice
Merfolk	30-300	7	15 (swimming)	1 + 1
Sahuagin	30-300	5	18 (swimming)	1 + 1
Dolphins	2-20	6	21 (swimming)	2
Giant Crabs	2-12	2	6	2
Giant Eels	2-12	8	12 (swimming)	2
Men-of-War	2-12	8	3 (swimming)	2
Sea Horses	2-20	7	18 (swimming)	2
Crocodiles	2-12	6	9 / 12 (swimming)	3
Sharks	2-12	5	21 (swimming)	3-6
Kraken	1	3	15 (swimming)	12
Sea Dragons	1	2	18 (swimming)	12
Great White Whales	1	2	18 (swimming)	16

These aquatic monsters all have the ability to swim and breathe under water indefinitely, except where otherwise noted.

Merfolk (Sea People)

Merfolk have human heads and torsos and fish tails. They live in cities beneath the sea, where they live, hunt, trade, and enjoy themselves just like humans on land. Merfolk nations have even been known to go to war with each other, though their true enemy is the evil sahuagin. As aquatic creatures, merfolk get on well with sea creatures and ride sea horses and dolphins as mounts. They prefer spears and nets as weapons and wear armor made of seashells. Though merfolk prefer to breath water, they can remain on land for up to four hours at a time. They will sometimes sit on the beach, hoping to attract the attention of humans of the opposite sex. Merfolk, if chosen as a player character, advance as fighters, but cannot progress further than 6th level.

Sahuagin (Devil-Men of the Deep)

Sahuagin are devils of their deep. They have leech-like mouths, razor-sharp yellow teeth, and green reptilian eyes. They live in large cities and worship a host of Chaotic tentacled monsters, whom they serve. Sahuagin feed exclusively on the flesh of men, elves, and merfolk and take great glee in the killing and torture of their victims. While merfolk ride dolphin and sea horses, sahuagin tame and ride sharks. In combat they favor tridents, nets, and daggers as weapons. High-level sahuagin advance as fighters and magic-users in the same manner as elves. 

Dolphins

Dolphins are high in intelligence. They travel together in packs and can communicate with each other by screeches and whistles. Dolphins will come to the aid of human who are attacked by other denizens of the deep. If trained and outfitted with a harness, they can carry a rider into battle like a sea horse.

Giant Crabs

The heavy shells of these armored crabs are four feet in diameter and their powerful pincers are nearly a foot long. They cannot swim, but rather walk across the bottom of the ocean. While they stay close to water, they can move across land unimpeded. Giant crabs are territorial and will not hesitate to attack. Mermen hunt giant crabs for food.

Giant Eels

These creatures live in rivers and oceans. They are long, grey fish, measuring up to 7 feet long. Giant eel hunt by stunning their prey with an electric shock, which delivers 2 dice worth of damage. A single eel can generate 3 such jolts every hour. 

Men-of-War

The bodies of these giant jellyfish stretch 6' across and possess 10-60 deadly tentacles, each up to 100 feet long. A man-of-war's attacks do not inflicts damage; instead the touch of its tentacles will paralyze a character, who the man-of-war then begins to slowly digest. Men-of-war live in deep seas and oceans, far from land.

Sea Horses

Sea horses serve as steeds to mermen. While they cannot attack on their own, a seahorse's speed makes a mounted merman armed with a spear as a deadly combatant as an armored knight on land. Sea horses can he captured and sold for great sums of gold. An adult is worth upwards of 2000 Gold Pieces while a young sea horse sells for 500 Gold Pieces.

Crocodiles

These vicious predators live in swamps nearby rivers and lakes. They stretch nearly 8 feet long and weigh up to 180 pounds. Crocodiles will wait, hidden in muddy waters, to attack travelers without provocation. They will even attempt to overturn small boats in order to feast on the passengers inside.

Sharks

Sharks vary in color from orange to light blue. Most can reach sizes of 12' in length. Sharks can detect the scent of blood in water from extremely long distances. Enough blood will result in a feeding frenzy. Larger sharks (up to 20" long) have up to 6 hit dice and are vicious creatures that inflict 2 dice of damage on a hit.

Kraken

Kraken are huge, fierce octupoids. Their bodies are the size of whales, and they have pointed beaks and red eyes. Their tentacles are so long they can rip apart ships in a matter of minutes. In combat, a kraken can make 6 attacks each combat round, each of which inflicts 3 dice of damage on a hit. While only semi-intelligent, kraken gather gold and treasure in their deep ocean lairs.

Sea Dragons

Sea dragon are 30' long sea serpents with thick green scales. They can breath fire in a 9" line, 1/2" wide, up to three times per day. Any creature caught it their breath weapon takes 6 dice of damage. A sea dragon's bite inflict 3 dice of damage and, like purple worms, sea dragons are capable of swallowing their prey whole. Any die rolled to attack that score a 20 (or else 4 more than the number required to hit) swallows the victim alive. A swallowed character will be dead in six combat rounds and completely digested (thereby preventing resurrection) in twelve unless the sea dragon is first killed.

Great White Whale

These are the largest mammals found in the sea or on land. They can reach lengths of up to 300 meters and are truly a spectacle to behold. Rather than doing actual damage, the great white whale simply swallows its prey alive. A swallowed character will be dead in six combat rounds and completely digested (thereby preventing resurrection) in twelve unless the great white whale is killed before then.