The Discovery of the Sea of Thieves
Daydreaming At Old Sailor's Isle
Fascinated by the Devil's Shroud, and keen to find a way through it, Ramsey spends much of his time on a small island that appears to be closest to the fog as is possible. Dreaming of piles of glittering gems or huge leviathans the size of galleons, Ramsey wonders what lies on the other side of the fog.
He records many attempts with various ships of differing sizes to find out the twisting routes that provide safe passage through the shroud.
Source
Tall Tale: Maiden Voyage, Journal: So Near and Yet…
The Crossing of the Devil's Shroud
Knowing he'll need specialised help if he wants to cross the Shroud, Ramsey seeks out additional crew members and a ship. He visits Magpie, the Shipwright, and buys a tiny vessel for this voyage to cross the Shroud. Then, he ends up meeting with Mercia in a dusty library, and Shan in a pub. Rathbone, an acquaintance of his, also agrees to join him in his adventure.
After days sailing through what felt like literal hell, Captain Ramsey and his crew of the Magpie's Wing make safe entrance into the then unnamed and uncharted Sea of Thieves, devoid of any human civilization. They discover the art of those long-dead people, venture into caves and ruins, explore wrecks, chart and note everything they can, take or bury everything they can't take.
Source
Athena's Fortune
Rathbone's Secret Pact
After spending a month in the places surrounded by the Devil's Shroud, Ramsey and crew return home to tell their stories and regale unbelieving pirates with tales from their adventures.
Stitcher Jim calls Ramsey a liar to avoid telling how he had made the crossing and how others might do the same. In disagreement with Ramsey to keep this knowledge to himself, Rathbone secretly gives Jim a copy of the map to cross the Shroud in exchange of his loyalty. Jim quickly takes this opportunity to get some coins by selling the map to other pirates.
This then marks the beginning when pirate crews venture through the shroud and into the uncharted waters of what they call the Sea of Thieves.
Setting Up Thieves' Haven Hideout
Ramsey and crew return to the Sea of Thieves and decide on creating a hideout on the island that is now known as Thieves' Haven, stashing their loot and belongings there whilst out on other Voyages.
During their time on Thieves' Haven, Shan invents various things, including an expanding metal that allows cannons to fire people to be made. Mercia becomes interested in the magical properties of the Sea of Thieves and starts documenting everything for her library.
One night, after returning from a Voyage, Ramsey and crew find their hideout ransacked, the place ruined and their treasure stolen. It is later revealed that this was planned by Rathbone who was growing discontent with the way that Ramsey was doing things.
The First Battle
One of the earliest observed battles in the Sea of Thieves is the fight between the crews of the Mermaid's Fortune, the Serpent's Lie, and the Mad Monkey.
Although it looked like the Mermaid's Fortune was going to win, the crews of the Serpent's Lie and Mad Monkey lured the former crew to drink with them. Whilst the crew of the Mermaid's Fortune was inebriated, the latter crews laid into the Mermaid's Fortune ship and sunk it. Those two crews then turned against each other and it is unknown who the victor was.
Source
Tales From The Sea of Thieves
Making Contact with the Merfolk
One evening in a tavern, Mercia meets an old woman who tells her that she has seen something strange in the water and made a detailed map to find back this place. In her quest to find some of the magic of the Sea of Thieves, Mercia decides to recover this map from the wreck of the old woman's galleon that sank after a battle.
After retrieving the map, Mercia and crew set sail very closely to the Devil's Shroud at this location that is barely an island and has only a sinkhole at its center. During their exploration in these underwater tunnels, Mercia and Ramsey discover a mysterious chamber lit by magical blue flames and two pearl earrings.
The moment Mercia put the earrings on, the strange echo that surrounded the maze became a joyful chorus and two mermaids and their queen appeared in the central pool. The earrings were allowing Mercia to communicate with the merfolk. The latter thought Mercia and Ramsey were the descendants of the Ancients and remembered them.
The Merfolk Rescue
At the behest of the Merfolk, Ramsey and crew set out to rescue two Mer who had been captured by Captain Douglas. They arrive at the location with the ship lights off to approach as covertly as they could. Then, Shan and Rathbone used a river and headed downstream into a cave, as quiet as mice. Once inside, they discovered two imprisoned merfolks whom they hurried to free.
As they search for a way to escape, they come face to face with Douglas. During the battle, Ramsey flew backward and triggered some kind of ancient mechanism, possibly a trap left behind to protect the shrine. A ghostly blue light flooded the cave and illuminated Douglas, cursing slowly his flesh into stone. Merfolk, Ramsey and his crew escaped just in time before the shrine collapsed.
Unshackling Old Mother
Returning the favour of the rescue of the Merfolk, Ramsey and crew are brought to the shackled remains of Old Mother. They are believed to be somewhere in The Wilds and are large enough for a galleon to sail through with plenty of space.
Reduced to a mass of bones, the chains no longer had reason to be there, so Ramsey commanded his crew to remove the locks and chains and bring them to their ship.
Ramsey set his crew to re-working the enchanted chains into locks and keys for treasure chests, so that no one without the proper keys can open the chests. During this time they also learn more about the magic of the Sea of Thieves, particularly how to enchant objects.
Enchanted Duelling Pistols
In an adventure that is yet to be told, Ramsey discovers a pair of enchanted pistols. These pistols prevent any weapon from being fired in their presence, as well as gunpowder being unable to be lit.
One of these pistols can be found in the Unfired Pistol Tavern, which Ramsey bought and made Rowenna the proprietor of.
Source
Sea of Thieves Vol. 1