Leviathan
The Leviathan is a pure white sea monster, along the lines of the Kraken or the Deep Sea Serpent but much higher-end. It is found by using a Fabled Fishing Net and is a very hard fight (unless you've brought along a Greater Dragon, in which case several Bandages and a few Greater Heals will probably see you through).
Be warned, the moment the Leviathan appears it will target the character who threw the net in the water (assuming that character is visible and in range). Water Elementals, Sea Serpents, and Deep Sea Serpents will also appear.
Upon beating it, there is a chance of receiving one of the various Minor Artifacts directly in your pack. The odds are helped by your Luck, though the person who initially threw the net has at least a 25% chance of an item.
The Seahorse Statuette and Ghost Ship Anchor are available exclusively from the Leviathan and considered very valuable.
Additional Details
The Leviathan is a terrible creature that lives in the very deepest parts of the Britannian oceans. It does not often happen that the Leviathan comes to the surface voluntarily, but it can be forced to surface by trowing a Fabled Fishing Net into deep water.Upon the death of a Leviathan those who did the most damage to it will have a chance of receiving a Minor Artifact.Fabled Fishing Nets can be found among the treasure from an Ancient SOS message.
Found: Fished up with a Fabled Fishing Net
Special loot: Rope, Message in a Bottle, Ghost Ship Anchor, Seahorse Statuette, The Admiral's Hearty Rum, Candelabra of Souls, Captain Quacklebush's Cutlass, Dread Pirate Hat, Ship Model of the H.M.S. Cape, Alchemist's Bauble, Arctic Death Dealer, Blaze of Death, Burglar's Bandana, Cavorting Club, Enchanted Titan Leg Bone, Gold Bricks, Gwenno's Harp, Iolo's Lute, Luna Lance, Night's Kiss, Nox Ranger's Heavy Crossbow, Phillip's Wooden Steed, Polar Bear Mask, Violet Courage, Level 5 Treasure Map