The Secret Weapons
I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.
The refusal of the combined elementals to fight for the original elementals at the end of the great elemental war caused the original elementals to become so angry that they used four weapons that they had been developing in secret. The weapons were so devastating that they destroyed all of the elemental's cities and conducted a major reshaping of the map. They ceased the continual eruption of volcanoes, thrust Æthelron out of the sea bed, caused a major shrink in the size of The Middle Mountains and caused the start of the wind.