The arm of Grandfather Paradox that was cut off during the Act of Severance had a totemic significance to Faction Paradox.

Devonire, however, did not understand the nature of that significance. Lost after the Act, he hoped to lure the Faction back to the Homeworld if he could find the arm and return it to them. However, when he discovered that the one he bargained for with the Immaculata Formosii was his own future cut-off arm and that the Faction had no interest in it, he descended into madness with a fullblown case of paradox anxiety. (PROSE: The Book of the War)