Between 3 Tribes

The world is divided. Separated in 3 different Tribes.
The Tribe Of Horse, respecting courage more than anything else. They cannot summon light or healing, and they cannot fly, but they can see the future and the past.
The Tribe Of Pegasus, the most honorable of the 3. They fly on beautiful wings of silky feathers, their steps are light as a bird's.
And then there's The Tribe Of Unicorn. The wisest of the Tribes, they can heal and radiate light with their horns.
They all live separately other than a meeting every full moon. That is, until, an Alicorn is born.