what is a geas
Geas. 9,218 pages on this wiki. Geas is an archaic Forerunner term that refers to a generations-long genetic command imposed on an organism or species. Under the influence of a geas, an organism can be given a set of subconscious orders that will be passed on to their children, in some cases lasting several generations.eas. 9,218 pages on this wiki. Geas is an archaic Forerunner term that refers to a generations-long genetic command imposed on an organism or species. Under the influence of a geas, an organism can be given a set of subconscious orders that will be passed on to their children, in some cases lasting several generations.