User Summary In the world of Castlot, set in Britain's 6th century Medieval era, you can choose the righteous Bright Knights of King Arthur fighting for the resistance, or the formidable Dark faction of Lord Blackmore, attempting to overtake the kingdom. Castlot is a free browser MMORPG. It introduces multiple innovative features, such as the Framing system, to enhance gameplay, an array of troop types and more.