Drifting Sepulchre is a three page adventure for Mork Borg. The page text frames it as kind of a goofy, duck-centric thing, but it goes hard. The writing is top notch, and the whole thing feels like a very eerie, very plausible folktale.
The PDF is mostly hand-illustrated, apart from the classical art cover. The interior images split the text up a bit, but it's not hard to read, and the final illustration is stellar.
Content-wise, the titular sepulchre is a roaming site. It patrols Lake Onda on its own, and can be difficult to track down. And if you do locate it and avoid being drowned by ghosts as you boat over to it, there's not much inside. Just duck droppings and a very deadly ghost.
Interestingly, this adventure introduces a lot more threat to Lake Onda, and it also comes with a way to pacify the lake. Break into the mausoleum, ignore your impulse to loot and fight, and leave an offering instead---and the lake is nice to you from then on.
Overall, if you want an eerie and tragic adventure site that the players might encounter, and if you want to add a lot of character to the Lake Onda region, I'd strongly suggest picking this up for your dying world game.