Unnatural corpse

An Unnatural Corpse is an entity that appears in your colony via events. It looks like a copy of your still living pawns. As soon as you get the corpse, it's original copy will suffer from a mood penalty as well as the corpse sometimes teleports near to it which causing an unique mental break where it will drag a random corpse to "present" to other pawns.

There is no way to get rid of the corpse as it will reappear eventually. Once it "wakes" up, it will chase and hunt it's original, where the victim will be hypnotize for a several seconds before their brains got consumed. The unnatural corpse is virtually impossible to kill, having similar to a Ghoul's unnatural regeneration but faster.

The only way to get rid of the corpse before it awakes is to study it which take several days. After that you'll get a notification that your colonist will able to remove the shard implanted on the corpse, which will destroy it. You can still keep it around optionally to study as it gives "advance research points" for the dark research tab.