Lorekeepers: Marty and Adam
"It jist floatin' thar! It's gold and you need to go git it! Watch ou' fer the sharks n squirrels tho." - "Captain" Alexander Higglesworth Swanton III (aka Squim)
Two planets rocked by the destructive magics of the previous inhabitant now exist solely as islands floating around a magical gas that contains riches untold.
This is a swashbuckling airship world using mostly standardized 5E rules
In times long since forgotten, planets in the Ejya system wielded magic and science with utter disregard of the consequences losing some planets entirely and destroy all the others except Foresight's Continuum. Two of these planets blew apart into thousands of pieces, but the residual magic coalesced between them causing a loose gravitational pull and merging piece of the former planets, Nesoth and Nothevis, into a large, loose orbit.
The Continuum is aware of the planet and the magic within, but prefers to instead live in their utopia, practically ignoring Nesoth and Nothevis. It was in thus that pirates first discovered the haven of clouds and ruins. However, it was the same pirates that learned that the cloud contained pieces of precious materials - gems, gold, and more - and began to harvest them. Yet, they also discovered the violent storms that rip apart most Spelljammer ships and arrive and leave suddenly, with great and terrible creatures in its wake.
There are untold riches literally floating on the clouds between these two planets. A privateer can make lifetimes of gold if they are willing to risk ship and limb in the massive storms and dangerous creatures that inhabit the cloud beneath the islands. However, the deeper into the center of the cloud you go, the less likely you are to come out - even hardened pirates and ageless sages have been lost to the cloud.
However, there are places to moor a Spelljammer and buy a smaller airship skiff to try your fortune - and there is always plenty of work building more airships for the ones continually lost.
Nesoth and Nothevis only has no variant rules