Throughout the 5th century, the Kidarite Kushans suffer attacks by the White Huns who subdue them slowly. In the end, Kidara becomes an Huna vassal and helps it in the struggle against the local dynasties of the Guptas. However, as the fortunes of the Hunas wane, the Kidarites switch sides and once again re-establish themselves an independent state.
The Kushans avoid destruction of their state by the Ilkhans only to be brought low by Tamerlane. However, Kashmir once again proves to be a refuge from which they emerge to stop the descendants of Timur from claiming northern India.
Having made some correct political decisions in the tumultuous 20th century, the Kushans find themselves masters of a state that far exceeds the Empire of even Kanishka. The future looks, in a word, bright - as long as they don't antagonise China.