Lore
As a child I heard tell of the will-o'-the-wisps — 'the shimmering lights'. They haunt the night-time swamps, for those foolhardy enough to walk there — and only if you bring an offering. Not any offering: the wisps hunger for our grief, rage, hatred and regret. Feed them, and they might lead you to riches mouldering in the marsh, dropped by wanderers dead long ago... or they might lure you off the path, and you will join the dead yourself.