Grasp of the Undying, otherwise known as Grasp, is taken into most matchups due to synergy with Divine Sunderer. It is the safest rune page to go, but it does have it's downsides into bruiser champions who will always out damage her, such as Jax or Sett. Fiora can't use this page into those types of matchups.

Parry Carry's Fiora Guide