Currently, there is a special phenomenon on Elvian, the Elven's Origin planet.
The phenomenon was called 'Harvest of Life', which sounded rather grotesque and as if billions of lives would have to be sacrificed but the name was cleverly deceptive and was actually something pretty nice.
The planetary mana core had reached a state of oversaturation, which happened every few centuries. In such a case, Elvian would then release all the mana accumulated within the planetary mana core to the outside to create various special phenomena.
One of these phenomena was 'Harvest of Life', which was basically the acceleration of the growth phase of everything living, whether it was nature, beasts, Elves, or any of the other races that felt the Harvest of Life's influence.