500 Worlds: Titus ,The Battle for Unity Begins is a narrative expansion for Warhammer 40,000 that chronicles the opening stages of the war for the 500 Worlds, focusing on the Vespator Front and the legend of Captain Titus. Presented in a slipcase with three softback books and a rules-and-lore booklet, it's an essential addition for narrative players and Ultramar fans alike.