Sirens of the Storm- Shipwreck Saviors

Since the Fall of Crossroads, the seas of 4 Corners has now become the primary form of travel. With three moons at ever different phases, however, it is and always has been a dangerous occupation. Navigation has always been challenging, the tides have battered hulls and thrown ships off course to centuries, and the storms that brew at sea are legendarily dangerous. 
While 4 Corners is an expansive single continent where the vast majority of people live, there are dozens upon dozens of smaller islands that are mostly uncharted. Most ships that manage to come across a number of these islands rarely survive their trips back to the mainland depending on how far off course they were when they found the landmasses in the first place. 
With all the dangers, a story does brew among the various sailors throughout the generations. It is a story of a group of magical people who bring salvation and mercy to the sailors lost at sea- The Sirens of the Storm.
The time immediately after Cataclysm the worship of Marus and his magics were banned. Anything with his iconography, knowledge of his spells or divine guidance, or any of his relics were set to be destroyed. The six families were certain that they wanted any knowledge of Marus to be banished to the ether for eternity. Yet, the legend says that there was, in fact, a 7th family that survived the almost entire annihilation of the Southern Corner people. And, that family took as much as they could-books, armor, weapons, and magical focuses with them before the 6 surviving families could destroy it all, loaded it up on a ship, and then sailed away for good. They were never heard from again.
That is until a ship in the South Eastern seas faces a massive tempest where all hope of surviving the squall is lost. Losing a ship may be a common tale, but those who have managed to survive the wreck tell the story of beautiful aquatic people who rescue the sailors from the battered pieces of the ship and swim them to the small, remote island that they call home. Images are always cloudy and memories vague, but all sailors will find themselves waking up safely in a bed at an inn in a familiar city the next morning with little to no knowledge of how they managed to get there. 
Some survivors will recount vague images of a people and an island, but nothing familiar ever comes back to memory other than a lost ship, nearly drowning, and a mysterious rescuer. Memory manipulation magics were a once common practice among the Maran faithful, so those who take the tale to heart believe that those may be in use to keep the place a secret. However, for most who hear the stories, they rarely ever believe that the sailor encountered anyone. Often, the simply wave off the account as a bad dream of a shipwreck and move on to the next job. 
However, it doesn't stop a number of sailors from invoking the Sirens' name before embarking onto the tumultuous seas.