Tirsa, a manufacturing planet, existed in the Tirsa system found within the Outer Rim Territories. The Tirsa Wargear firm, which produced the Leviathan submersible carrier, was based there.
In the time of the Galactic War, Tirsa's native creatures adapted, becoming dependent on the spice deposits present there. A study was conducted on their unusual biological makeup, and it was discovered that the spice had fused with the blood cells of the animals, after analyzing blood samples taken from them.