A link between eras.

It is hard for those who are forced to fight against the whole world. It is difficult to live in constant danger. And so, the inhabitants of Tatalia, who survived the constant battles with humans, elves, and mages, went underground. Some of the elves, realizing Helu's guilt, followed them. This is how the first kingdom of the twilight elves was formed. It did not last long, but when new streams of elves went underground, they were met there by their brethren.