My intuitive research gave me this explanation, and I have no "outside authority" to claim as its source, just my Guides from God.
The Lightworkers are a select group of previously ascended masters that have the opportunity to participate in the transitions of The End Times into The New Age of Enlightenment. There are a majority of devolving souls on Earth that simply are not suited to do the missions given to the Lightworkers. Not every Lightworker is awakening to their great missions, but there is still time.
The First Wavers came in earliest, and have invested decades of training to become teachers and WayShowers to the other Lightworkers. They are ancient souls, and every one of them must endure some kind of martyrdom, in service of humanity.
The Second Wavers are the parents of the Indigo and Crystal Children, a very important mission.
The Third Wavers have very intense missions in The End Times. Most of them will not bear children because they have this important work to do.
The Indigo Children are super talented in at least one arena: intuition, art, music, super-intelligence, athletics, etc. They bear many gifts of spirit, and do have different genetics. They can easily communicate telepathically with each other 'round the world.
The Wavers and Indigo Children all bear some past life karma to pay down. The Crystal Children are pure souls with no karma, and with superior talents and gifts. They are the greatest martyrs, healers, alchemists, artists, prophets and teachers. They will be the leaders in the future.
Scribed by Julia Big Hug