Considered by even the most experienced pilots to be a nightmare to fly, the XF-6696 Diablo II was developed as a black project by joint forces of the Federal Republic of Yassia and the Kingdom of Nordenvok in the early months of 1996, however the diablo project was scrapped due to its high instability and low funding, despite the setbacks, one prototype was developed in 2025 - nearly 30 years after the initial conception, and just days before the third global war took place. During the first days of the war, the XF-6696 Diablo II dissapeared without a trace, leading both militaries to believe it was destroyed in the firebombing. it wasn't until mid 2029 that reports of an aircraft with the same body frame and maneuverability surfaced under the control of the Andosnian forces. Shortly after the confirmation of a development facility of the Diablo II, Yassian forces deployed sub-orbital bombers to destroy the plant to eliminate the aircraft once and for all, however, despite the destruction of the plant, almost 300 aircraft were developed and were deployed, giving the Andosnian military an advantage in air superiority.