Purely out of curiosity, has anyone ever tried throwing in unknown, unnamed things into your game? If so, what was the intent when it was introduced? Adding horror elements? Making your players realize just how little the Star Wars Galaxy knows about their own universe? Simply for fun? How did you run the encounter with said unknown entity?
I'm asking because in the last session I ran, the players came across a derelict Dreadnaught-class Heavy Cruiser, and discovered that the captain of the cruiser had gone insane staring out into hyperspace, and something caused him to vent his entire crew into the inky void of space during his fit of madness. In the next game, as the players are jumping from the location of the Dreadnaught to Nar Shaddaa, I thought it would be fun if the pilot caught a glimpse of the eldritch thing drifting through the mesmerizing swirl of hyperspace. The encounter won't be long enough to permanently break the mind of my player character, like what happened to the captain of the ill-fated vessel the players just escaped, but it will still be enough to remind the players that the Star Wars galaxy is vast and full of scary things, not all of them known or understood. Nameless things wander through Wild Space, the Unknown Regions seem to actively repel any expeditions lead into them, with many dead or insane, if they ever return at all. It's something I've been wanting to dive into for a while in my game, and the Halloween game I ran was the introduction I needed to introduce these elements.