War of the Magi
The War of the Magi was fought nearly 2000 years ago. Arising from a dispute of the use of arcane power, the war was fought across the face of Edgramon (the world undivided). Divisions arose when several orders of wizards came to believe that their powers entitled them to rule over all of creation. Opposed by the remaining orders and those in the world who desired freedom the world was ravaged with unchecked magic and weapons of terrible power.
As time dragged on the war and the destruction it wrought cast despair on followers of both sides of the conflict. Finally the Warlord Isossus ended the conflict using a powerful ritual that split the world into two halves with the stronghold of the tyrant wizards being banished to another orbit. Scars and distrust still run deep against arcane wielders but this has rarely led to open conflict or purges since then.