The Gerasene Host, were a little-known Blackshield warband that appeared during the middle years of the Horus Heresy in the 31st Millennium. The Host appeared to be the result of rapid, unsanctioned gene-seed hybridisation processes first encountered in the middle period of the Heresy. The source of the Host's gene-seed is unknown and the warriors themselves appeared unaware of their true lineage. Some Imperial strategio-savants have posited that the Host were created as a living terror weapon, wrought by an unknown hand and released into the galaxy to sow death and destruction in the ultimate furtherance of the Traitors' cause.