the basic premise of the au is it's a davesolkat space/rebellion au where sollux and karkat have a cargo ship called the abraxas where they shuttle cargo and also all of their close friends happen to be revolutionaries.
dave lives in a place called hephaestus which is a wildspace outpost primarily populated by mechanics and engineers. he lives and works with equius and nepeta.
dave and sollux meet at a bar when sollux and karkat come to hephaestus for equius' help with the ship and dave spends like half an hour infodumping about how cool he finds the abraxas to sollux, not know sollux is its pilot.
theres a lot more going on generally in the au and also with it's worldbuilding but its something ive been brainrotting on recently.