The Egg o' War (originally known as the Wily Egg) was a flying fortress created by Dr. Eggman and Dr. Wily within their own pocket zone, the Skull Egg Zone. It served as their base of operations while they activated the second Genesis Wave using the power of a Chaos Emerald in order to reset their respective worlds and sent the Roboticized Masters to collect the remaining Chaos Emeralds. Following their defeats, the battle station was transported to the Sol Zone, where it was repaired and renamed to its current name.