The giant, floating brain creatures known as The Host seem to emerge from stone monoliths found on certain planets. Whether they are actual entities or psychic projections of some other being is unclear. Hosts are tough foes and can only be destroyed using manual lasers. Each Host controls several 'archangels', skull-like flying heads that swoop down and attack colonists, driving them insane. If this happens, send the unstable operative to a counseling robot or detention facility until mental health is restored.