The Third War of the Skies is mentioned twice in the game. Little is known about it, other than that we can infer it was a fight of fire vs ice. We can say this because in game info says that Referi Jerator, Ice Wizard, and Broyle Lindeoven, Fire Mage, faced each other. Broyle Lindeoven won the war, but only due to an accident on Referi Jerator's part - Referi Jerator tripped on a rock misfired a powerful incantation, which froze his head solid. No First or Second War is ever mentioned in Clicker Heroes.