"Like an iceberg, like a Bazaar-Master's scheme, like the Neath itself, most of the Hold is invisible. You see only a tiny portion of sculpted coral - the rest waits below the surface. The Fathomking's bone-rooms and aquaria. His pearl-snares and his dining-chambers..."The Fathomking's Hold is the mostly-underwater home of the Fathomking, lord of those who have drowned. His actions are unpredictable, and though any who bring him a story may ask a boon, doing so is not always wise. He can reunite lost shipmates with their captains, though this service is never free.
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These are things you can do in Sunless Sea: Zubmariner.
It's possible to do the freaky freaky with a Drownie. It will lay coral eggs afterward.
It's also possible to bring the Fathomking a spore from the Uttershroom. He will proceed to drop it to his nether regions. Well, who knows what he does with THAT.
Also, the Fathomking's wife is a Lorn-Fluke.