There's nothing better than coming to the table intending to basically wing an adventure, dropping in the tiniest bit of atmosphere into the description of a Dyson Logos map and just letting the players wind themselves up imagining all sorts of horrors.
The players basically convinced themselves they were descending a dungeon beneath a wizard's tower into Hell when my contribution was to squint at a mysterious structure on a Dyson map and say, "uh, it's a strange altar with a bowl meant to collect some sort of liquid sacrifice on top. The altar is warm to the touch."
Having failed to give out any meaningful treasure this way, I agreed that the PCs could take some of the esoteric books they found and sell them for 50 gold pieces each.
"But you need to roll a d6 for each one." I gave no other information.
They were so spooked that they returned to town with no treasure, not having encountered anything other than the confused ghost of a military wizard of some sort, and were convinced they had escaped getting sucked into Hellraiser.