Windborne

"Windborne" is a term used to describe young Wood Elves born with a craving to explore and wander the wider world, contrary to the Wood Elves' isolation.

History
The life of a Wood Elf is one of tireless service to the great forest of Athel Loren, protecting it from those that would do it harm. Sometimes, however, a young Asrai is born with an urge to wander, an overpowering curiosity and desire for adventure that will not be denied. Known as the Windborne, this Wood Elves can be vexing to their elders but have the potential to become great rangers if their adventurous nature if properly harnessed. And so young Windborne are given leave to wander the wide word for a short period of time, no more than a hundred years and a day, to see all they can of the wider world before returning to Athel Loren and taking up their duties.

Source

 * Warhammer: Chaosbane