During the closing days of the Emmeria-Estovakia War, Dvornik and members of the Estovakian Forces who opposed the peace talks commandeered the Chandelier, where they plotted a final counteroffensive.
Korol is one of the named aces found in Ace Combat 6: Fires of Liberation, he appears in Mission 15 of the game if played on Expert difficulty or higher. He is the one ace in the game, where if shot down, does not grant the player the livery of his aircraft due the F-4E Phantom II not being playable.
Dvornik was born in Estovakia in 1967, and joined the Estovakian Air Force at some point of his life. When the Estovakian Civil War broke out in 2007, he assumed control as the Supreme Commander of the Eastern Faction, one of the five main factions of the conflict. The strongman of his forces, he made his objective to reunite the splintered Estovakia, and fought tirelessly to achieve this goal.
In the 2010s, his group acquired experimental technology brought in by defectors of the Principality of Belka, which were used to create the "Estovakian Aerial Fleet", a flotilla of combat airships. Aided by the power of the heavy command cruiser called P-1112 Aigaion, the Eastern Faction crushed all opposition, ultimately emerging as the victors of the Estovakian Civil War.
After the conclusion of the war, Gustav formed a committee of military leaders known as "The Generals". The junta assumed control of the Estovakian government, convincing the Estovakian populace that a military dictatorship was the only way to restoring order to their nation.
On August 30, 2015, Estovakia invaded the Republic of Emmeria, starting the Emmeria-Estovakia War. Dvornik assumed the role of Central Forces Precinct Commander and Expeditionary Forces General, using blitzkrieg tactics to drive the Emmerian military off the mainland and temporarily bring the continent under Estovakian hegemony. Nevertheless, he was unable to counter the Emmerian retaliation, which, among other things, resulted in the destruction of the Estovakian Aerial Fleet and the death of his daughter, Irena.
Prior to the liberation of the capital of Gracemeria, Gustav fled the city and slipped past the Emmerian forces to return to Estovakia, where he plotted to use the anti-asteroid Chandelier weapon to annihilate the city. On April 1, 2016, the Emmerian military assaulted the Chandelier at Sonne Island in northern Estovakia, destroying the last remnants of Estovakian resistance in doing so.
As a last resort, the soldiers responsible for manning the Chandelier attempted to fire a charged projectile at Gracemeria, in order to destroy the city in its entirety. As preparations for the final shot were conducted, General Dvornik tried to escape Sonne Island. He boarded an F-4E Phantom II at the base's hangar and entered the runway, followed by three escorts. As he fled, however, the group was bombarded by the Emmerian ace Talisman. As he prepared to escape, Gustav met his end at the hands of Talisman.
However, postwar Emmerian intelligence reports conflicted over Dvornik's cause of death. Some argued that he died when the Chandelier exploded, while others said that he was killed while trying to escape Sonne.
- His callsign, "Korol" means "king" in Russian. Conversely, his family name, "Dvornik", means "janitor".
- His rank insignia is similar to the US Navy's Fleet Admiral insignia.