The vastaya named the world. We named the trees, the wind, the mountains. We know their power.
The vastaya are chimeric creatures of Runeterra whose lineage contains both human blood and the spiritual magic of a pre-human race. From the ferocious, bestial power of 
Rengar to the foxlike allure of 
Ahri, vastaya can look considerably different from one another, but they all share animal and human characteristics.