The Tohaa are an advanced alien civilisation embroiled in a bitter war of attrition with the Combined Army. The Tohaa are a society of Seekers, searching for T'zechi Digesters, ancient artefacts that record the rise of civilisations and are receptables of all their knowledge, enlightenment, military and scientific knowledge. The Tohaa are also masters of biotechnology. In their war against the Combined Army, they have been known to use terrible viral weapons, and fight in invincible symbient armour. But after many years of war, the Tohaa have grown weary. Now they seek allies in the Human Sphere to help them win the war against the Combined Army.