Born of Blood is an expansion for the futuristic 4X game Sword of the Stars. It takes place in 2445, 30 years after the first stellar empires began to expand. Four races clashed and after the first wars an age of diplomacy dawns. A treaty that is torn to shreads when a new race enters the scene: the Zuul slavers, already hinted at in updates for the original game. They have new drive systems, ships, technology, and tactics, including psychic powers. The other races need to form alliances to take on this threat.