After winning the final Gods League (Totemius League), the player is moved to a King of Kings League, the winner of which is awarded the title of King of Kings.
Winning this title is the greatest honour in the game: there is only one King of Kings League for all players in the world and its winner officially becomes the best King of Thieves player!
Along with the title, the player will also receive a royal throne, outfit and a crown. The throne and outfit are unique and cannot be crafted or obtained from the Style-o-Thief machine. They are awarded to the winner of the King of Kings League and remain with the winner until the end of the next round. After that, if the player loses the lead, the royal throne is given to a new winner and the former king loses the ability to use it. If you manage to stay on top, you will continue to sit on the royal throne, which not only looks great, but also has the highest stats.
But even if you lose a King of Kings league, you can still wear the Royal Robe. Like any other outfit and throne, the royal throne, costume and the crown will be displayed during attacks, replays and dungeon saves (so you'll always know when you've been robbed by the King), and the name of the current King of Kings can be found on the leagues' leaderboards and in the outfit menu.