The Sea-born

All members of the Sea-Born were literally born at sea, on a ship cast off from its moorings. They believe this means they are specially favoured by Manann, and somehow bound to his service. A new member of the sect must swear never to set foot on land, and from that day they live on board a ship.

There are a few ships crewed entirely by Sea-Born, and these ships are often dedicated as roving temples of Manann. Children are born on the ships, and raised as Sea-Born; there are now some members of the sect who have never set foot on dry land, and, rumours say, some who have never even set eyes on it.

This sect is generally regarded as harmless by the cult as a whole, as most members are not militant about their superiority. Some say Manann grants special miracles to his followers in this sect, allowing them to repair their ships while still at sea. A common tavern tale is that the Sea-Born can drink seawater as if it were fresh.

Source
Warhammer Fantasy RPG 2nd ED -- Tome of Salvation pg. 104