After the 1st Launceen-Sazaki war, both sides began building up allies throughout Retough. War was on the horizon and neither side wished to be unprepared for the coming crucible. Ultimately, Sazaki managed to gain Sashao, Ykrum and Carina as allies while Launce secured Thulidea and the Arsinian warclans. Amkaor and Valesky remained neutral. Battles and landgrabs occurred all over Retough, the first few years being the most deadly. Land was passed back and forth as hundreds of thousands died simply to capture the same few plots of land. Usually by the time one side managed to firmly secure the area, the location had been reduced to nothing but rubble and barren land. The early days of this conflict saw the highest rate of destruction in Retough history, even surpassing the Hammer Wars in history erasure.
It took seven decades to end the conflict, though most of the fighting had ended well before then. Some contemporary historians even believe the war should be considered finished by 422, though this is highly debated. After the 430's, most activity exchanged between sides were blockades, tariffs, and political intrigue. Towards the end, the war ramped up once more and with it, the end of the Terasau royal lineage in Launce. A series of riots and sieges led to an overthrow of the reigning king in Launce, which brought about unconditional surrender from those who took leadership after the king's assassination.
This conflict saw the biggest border exchanges in Retough history. Launce and Sazaki were relatively unchanged, while Thulidea had lost a large portion of land to Carina to the south and Ykrum to the north. Also, Arsinia had managed to take complete control over the island of Tamn. Sashao had fallen into complete disarray towards the end of the war, to the point where all Sashao forces were recalled to defend the capital from riots and rebellion. The Fringe Collective, which had no stake in these wars, had collapsed and most non-human races were forced to assimilate back into human society, in a time where racist, anti non-human pogroms raged across the continent.