Scattered detritus of a story I dreamed

Locale

Spit's End
A dwindling settlement located at the furthest reach of a stretch of sand, dunes, and salt marsh extending out from Saddle Arabia, thought of by the locals as where beings end up when they're so destitute they've even ran out of spit.
While Saddle Arabians are known for their persistence and hardheadedness, the residents of Spit's End tend more towards stoicism and apathy.
The settlement was originally founded by notoriously blood-thirsty pirate marauder 'Merry' Celeste and even has a hospital. The ruins of one, anyway.

Cast

Jack (Honest Jack) - An amiable, beach-combing donkey, in a locale which can only afford the one; technically homeless, though he's perfectly content with the beach shack he threw together over the years; confesses to being mildly uncomfortable with being called 'Honest' Jack since he's of the opinion that it's easy to be honest when nobody has anything of value. Quite tall, in the Big Macintosh manner of things.

Jane (Just Jane) - A Saddle Arabian earth pony. The settlement doesn't warrant a mayor, and she considers herself as simply Spit's End administrator. Introduces herself to Jack as "Just Jane", Jack stuck with the appellation. I particularly like this since it has shades of her own inadequacies as well as meaning justice-minded.

Rampant (Rancid) Slimehocks - Another earth pony whose name is, (mischievously or maliciously?) misheard by Jack, this one is a lawyer who has been sent to Spit's End after the family law firm he's a part of identify Jack as the last living descendant and heir of ...

'Merry' Celeste - An ibex pirate. After years of abuse and forced breeding at the Capric mage-farm she grew up in, she eventually suffered a mental break, destroying it and fleeing the burning remains. She ended up becoming a highly successful scourge of the seas, inflicting her own suffering on others in a subconscious pattern of abuse. She founded her own settlement and even had her own coins minted from silver bullion, debossed with a seemingly random pattern of lines. Something like this, I think.
Her name is because she was decidedly not merry, as these nicknames are sometimes.

Story

Jane and Rancid meet Jack at his beach shack, (less a shack-nasty and more a shack-nonchalant) where Rancid informs Jack of his (good?) fortune.
As the last living heir of Celeste, he is the de facto owner of a significant portion of Spit's End. This isn't as impressive as it might sound since, as Spit's End is, as aforementioned, mostly sand, dunes and salt marsh.

In fact, the only property which is readily identifiable as something Jack now owns is the ruined hospital, and when I say that it's ruined I mean like, archeological ruins. Mostly-buried debris, crumbled walls and scattered bricks which show where the building used to stand, but nothing actually livable; no roof or standing walls, nothing like that.

Nonetheless, Jack feels a definite sense of responsibility so he moves to the ruins and starts sleeping there, out in the open and begins rebuilding the walls but, having not quite grasped that it's all his, he builds the walls around the ruins and makes them higher than needed so there's room for the rubble underneath when the floor gets put in. (I did mention this was all from a dream, right?)

Anyway, this is where the dream started to fall to bits as I approached wakefulness so I'll put down the bits I recall...

The hospital was less a hospital and more Celeste's manor-home and also the horror-movie type of hospital where Celeste lived and tortured her captives, so the ground around was soaked in hundreds-of-years-old blood and memories of her victims, their trauma and the trauma Celeste had never grown past.

Did I mention that this was Saddle Arabica, where storms from the Black Sea blast along the coast and impregnate the land with dark magic?

After a while, the building starts building itself (The floor is a parquet of wood and bone: this is the pattern I recall) and Jack painfully grows ibex horns over several weeks.

The last part I recall is an enormous navigation table putting itself together, each section with one of Celeste's silver coins embedded in the centre and strange cloud-like hollows where multiple coins could be inserted to form astrological or navigational images from Celeste's time, to form a guide to where the bulk of her loot (or something else) was hidden.
I remember the story lamenting that, due to the wide variety of astrological, celestial and navigational creatures and patterns which have been used over the years, that the pattern could never be completed. This struck me odd as they would all be a matter of record and there would have only been so many used when Celeste was alive.