Ursum is the main island of the Lucarcian Continent. It holds three of the major five houses and the centre of the empire in the city of Lucar. The island is split into three provinces, the Head, Spine and Tail. The Head is controlled by House Ruby, the Spine by the Imperial House Azure and the Tail by House Ebon. This island is buffetted by large waves and storms in the south, but the north and eastern coasts are tranquil and sheltered in comparison. The weather is mostly temperate with a warm, dry climate in the summer and wet but not too cold winters.
Ursum boasts the most relics of the ancient Rainbow Empire which collapsed about five hundred years ago with the catastrophe of the Writhing Death and the destruction of Antissa. Small ruins dot the landscape, most of which are avoided by the locals and farmers. These ruins tend to have strange magical or technological anomolies and defenses protecting them and although it is said great treasures can be found in their depths, the risks are simply not worth it for most normal folk. These ruins are a magnet for adventurers and mercenary bands alike however.