The vast majority of roguelikes don’t have any sort of plot at all. Or, at least, only the most basic bare bones of one. More of a framing story, something to explain what’s going on on only the most surface level. Going all the way back to the original Rogue, where you are simply trying to retrieve the Amulet of Yendor. Often, they run along those lines, get to the end of this dungeon and either retrieve this artifact or kill this evil wizard or whatever.