My brother, Robert, is my favorite DM. He can improvise almost anything, and never seems to be surprised or disappointed with the actions a player has his character make. He has had what I would classify as four campaigns. The first campaign was the generic catch-all, different dungeons and modules.
His second campaign, was a desert campaign that centered around Abdul’s. Abdul’s was basically a giant shopping center for the adventurers. One could get anything at Abdul’s if you had the gold.
Abdul’s was inside a giant mesa. If one looked up, they could see a Constellation class starship hanging from the ceiling.
I remember having to roleplay equipping our first level characters. I ran a thief, who foolishly asked for thieves picks and tools, and had to avoid the law.
Robert invented a couple of creatures, one was a mount called a quast. It was a fast-running desert creature that needed little water. It ran fast enough that a human rider could cross a large stretch of desert and not have to worry about dying of thirst. The other creature was a flying creature. I do not remember what he called it, but they came with a special saddle that had the commands on the saddle, and the word “avaunt” which meant to take flight.
One time two players had these new gizmos, basically Chinese repeating crossbows that could fire 10 bolts a round. They went to a cave and were trapped by a huge hoard of orcs, and rather than rely on our new weapons as Robert, the DM, thought we would. We instead drew our swords and died, a TPK becuase we did not rely on the tools the DM let us have.
Another incident we had in the desert was coming to an oasis and stumbling across a dimensional rift where a bunch of French Foreign Legionnaires were fighting desert tribesmen.
Abdul’s became a crutch for the players in this game and the DM had a great solution. Abdul had done something to offend some ghostly host that one night came and took away Abdul’s piece by piece, and we all watched it disappear. This was a transition to a new campaign Robert called “Quest For The Dice of Destiny”.