The Elemental Orbs

There are five Elemental Orbs and one resides in each of the Kingdoms on Rintha Gwinner. What did the orbs protect from/What threat did they defeat?
 * Elemental Orb of Wind (in Föhn)
 * Elemental Orb of Fire (in Chardac)
 * Elemental Orb of Earth (in Geoto)
 * Elemental Orb of Water (in Grike)
 * Elemental Orb of Lightning (in Arrester)