Geas

Geas was an archaic Forerunner term that referred to a generations-long genetic command imposed on an organism or species. Under the influence of a geas, an organism could be given a set of subconscious orders that would be passed on to their children, in some cases lasting several generations. Only highly skilled Forerunner Lifeworkers were capable of creating a geas.

In approximately 100,300 B.C.E., Bornstellar Makes Eternal Lasting speculated that the Librarian had imposed a geas on the human race. Forerunner students of the Mantle also hypothesized that the Precursors may have imposed a geas on the Forerunners themselves.

List of appearances

 * Halo: Cryptum