Elf: I Have a Vest in Team Rocket

Fusion world. This is a world dominated by elves. In ancient times, elves lived in their most primitive form. But why do elves now have to go through mage evolution stones to restore their most original form? Is this the evolution of species forced by the environment, or is there some unknown force intervening? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.