From the Dark
Half-elves aren’t created very often. But still, there are many of them about. This is because they commonly seek out each other. Half-elves don’t fit in well with either humans or elves. Humans are much more accepting of them, but there is an inherent wrongness of half-elves that silently bothers humans. So the half-elf population is largely self-perpetuating.
This is done largely in outcast villages. These villages commonly have half-elves leading them. This work swell because half-elves have grudges against no other outcasts and merely want all to be happy and peaceful.
But that is difficult in this world. There are terrors everywhere and no matter how remote the village, the darkness will reach all. So many half-elves consider it their duty, for the sake of outcasts and common folk alike, to journey into the mists and solve the world’s problems.