Bene Gesserit
When Shaddam is forced into a corner by Paul Atreides, the Emperor and his Truthsayer, the Bene Gesserit Reverend Mother Mohiam, realize that Shaddam's only option is treachery. Fenring is summoned and ordered to kill Paul, but refuses, aware that Paul represents the success of the Bene Gesserit breeding program of which Fenring himself is a failure.