So i'm setting up an adventure for my players to come across a derelict Star Destroyer on the edges of wild space. And I kind of want to make this a little bit of a horror adventure for them in the vein of like alien, or event horizon. This is set in rebellion timeline so i'm trying to avoid stuff like rakghouls and stuff like that, but does anyone have either some ideas for something that could be on the same level as the xenomorph, or maybe even something a kin to the creatures of Dead Space.

Personally I would go the opposite route. Mainly because once they defeat a creature the fear goes away. I would make a series of set pieces and checks slowly driving the characters insane or paranoid(when they fail) a la H.P. Lovecraft. When they do hit a monster I would make it the only monster, and tough(in non conventional ways) at that.

As for a specific monster; maybe the inquisition or a sith cult are trying to rediscover how to make sithspawn again. The great thing about sithspawn is they can be any twisted thing you want... even a resemblance of xenomorphs.

Edits: sorry had to fix where my iPad "helped".

yea like my plan is to more have them search through the ship and find stuff that happened to the crew kind of in the fashion of event horizon. And then have them start encountering things.

The notion of failed Imperial biological experimentation comes to mind, allowing you to take existing stats and modify them as you wish. What if it was on Mantellian savrips? If I recall correctly, experts debate whether or not they are actually sentient beings instead of creatures. Perhaps these have been modified/bred to become smarter, but they've reacted violently to it. They could even try herding the PCs into a particular part of the ship...

I would build up tension by including scenes with mynocks, malfunctioning droids and the like.

-Nate

Remember, you don't see jaws until very late in the movie.

You could have some fun with plain-old vermin. Imagine a pack of starving space rats infesting a ship - they ate what was left of the crew and multiplied, but that was months ago....

If you have any insight to your players' phobias, it could be fun to leverage that - but then again, that could backfire if it's not done just so.

I love games like that. Played through a module like this in an Old School D&D Clone system. Essentially what made it great was the fact that we basically solved the quest before we encountered anything dangerous at all, but we kept going further out of greed until were pretty much trapped and running for our lives incapable of confronting most of the horrors we unleashed

Could be worth having a look at for some ideas. It is easy enough to turn a dungeon into an abandoned space ship.

This is the module for anyone interested. I've tried to give minimal spoilers

http://www.lotfp.com/store/DeathFrostDoom

The campaign is just before hoth, and I'm using the pretext that the rebellion got the power core from a preatorII engine to power the shield generator for the base. The players come across the ship first and are going to be waiting for the rest of the rebellion to show up.

Go read up on Games Workshop's Space Hulk. This should give you some good ideas about running a game on a craptastic ship.