Fianto Duri- A defensive charm which, based on the etymology, strengthens shield spells, and perhaps objects in general, in a similar way to Duro.
Fiendfyre- Creates great spirits of fire which burn anything in its path, including nearly indestructable substances such as horcruxes. This fire is nearly impossible to control.
Finite Incantatem- Terminates all spell effects in the vicinity of the caster.
Firestorm- Produces a ring of fire from the wand tip that can strike targets.
