Revolution
Quick upon the heals of the truce with the giants that ended the Thousand Year War, a sect of silver dragons launches a sneak attack against the gold dragons claiming the sole divine favor of the deity Asgorath. The golds retaliate against the silvers, greens attack reds, and soon all of dragonkind is drawn into the conflict. Their ranks already depleted from the war with the giants, this five hundred year conflict is enough to significantly deplete the dragon population on Toril and actually threaten extinction.