I honestly think it has no affect on the lethality of arrows, though if they are fire arrows then it does, though not my much if I remember correctly.
I am the Carthaginian who became an angel, and surrendered his wings for a life on the sea of battle.
My magic screen is constantly bombarded with nubile young things eager to please these old eyes. This truly is a wonderful period in which to exist! - Terikel the Deflowerer