Call of the Kings - The Mirror Black, is an online hybrid strategy roleplaying game set in the Empire of Khadoria. It is a time of turmoil and with the old emperor at the brink of insanity and leaving no heir, all the nobles of the realm realize that they have a rightful claim to the Imperial Throne. Personal power struggles and treason leave everything - the economy, government and social order - in chaos. The goal of the game is to win the Imperial Throne, take control of the Empire and hold it successfully against the other players.
To accomplish this, each player controls a high born family of heroes and retainers. Players must rebuild the economy and fund an army by creating commerce in their towns, establishing trade routes and political alliances, building monopolies and collecting revenues from vassals.