First off, this is more of a vague concept as opposed to a full fledged idea. (even if I HAD a real idea, I might want to save it for my own personal usage) I've had a few nightmares in my life, where an unkillable SOMETHING (different every dream) or another is chasing after me because I "pissed it off" Yeah, seriously, and no NATURAL means can kill it... So I was thinking what if theres say, a tomb, (like an egyptian / avian tomb) if you take some treasure from it OR deface it in someway, an unkillable ghost will start chasing you FOREVER, as I stated above, its invulnerable to normal attacks, it kills you instantly with its attack, and the only way to get rid of it is to fix the damage / return the item, OR, possibly, lead it to some holy cleansing field or something to that nature. (The ONE thing that can actually kill it) This sounds like something a player wouldn't know to do at first though, so to balance it, I'd imagine the ghost or whatever IT is: 1. Looking intimidating, to drive home the point that you need to get the hell away from it, (or maybe it can kill a powerful NPC thats with you?) 2. Being INCREDIBLY slow, but be able to phase through any terrain, so it can get you ANYWHERE you go...on that planet at least...honestly, I think having it follow you to other planets would be somewhat bothersome, maybe it shouldn't be able to do that? Actually, aren't items / objects all scannable? Maybe they could give you hints about how to deal with this thing or avoid it in the first place, I could imagine Avian lore or something telling about how someone important to them isn't resting peacefully and will bring doom to anyone if disturbed. Wow this stuff actually started writing itself! If you DON'T like it, at least give a valid reason, don't just argue about it just for the sake of starting an argument, I WON'T put up with it! Yeah it MIGHT be game breaking or something, but how could anyone know? The developers haven't given us enough information to know that!