Can you have someone in your same area that is around 100+ soul level if you're around 70-80? It wouldn't seem fair to have someone that high of a level killing off everyone in one area and act like a bully for that region.

Could you rephrase that question a bit? I'm a bit confused towards what you are asking

There is supposed to be a level limit, but I know that only being for co-op play. Plus 100+ is pretty vague. If it's 100 and you're 80, that wouldn't seem too bad. But if it's a lot further apart, maybe something is up.

I think below lvl 100, you have to be at most 10 apart, and above lvl 100 I think it's 25.