...Basic. If what she said is true, then we were all brought here originally because we were accessible to the darkness, even in our own worlds. Initially we have to be "tethered" either as a team or individually as knights, with the nature of the person and the tether differing between the two.

But when we finish rebuilding ourselves, the darkness no longer retains it's foothold; it isn't a threat in the same way it is to heroes or knights.