DemonDestroyer

So I was doing the quest "Looking for Artifact", defeated all 4, but I was also being invaded by aliens and pirates. After I managed to clear them all I looked EVERYWHERE and scraped everything relevant to the bosses but I just couldn't find the artifact you gain from them. Is there a command to cheat getting it/them? Or can the quest turn up again so I can thrash them again and make sure I pick it up? Really don't want to lose all my progress to get to center just because of one quest... :(