Regicide is a game mode available in Age of Empires II. Each player begins with a Castle, extra Villagers, and a King. The goal is to hunt down and kill the enemy Kings to defeat them. Upon losing their King, players automatically and instantly lose the game. The Treason technology (available for 400 gold at the Castle in the Imperial Age) is a valuable tool in any Regicide game (and only available there), as it unveils the location of all enemy Kings. Before launching an attack on an enemy, it is best to research it beforehand in order to efficiently coordinate the attack.