Improved Manyshot( Epic Level Handbook, p. 58)
You can fire even more arrows as a single attack against a nearby target.
As Manyshot, but the number of arrows you can fire is limited only by your base attack bonus (two arrows, plus one arrow for every 5 points of base attack bonus above +6).
Regardless of the number of arrows you fire, you only apply precision-based damage (such as sneak attack damage or the ranger's favored enemy bonus) once. If you score a critical hit, only one of the arrows deals critical damage (your choice); all others deal normal damage.
With the Manyshot feat, you are limited to a maximum of four arrows fired (when your base attack bonus is +16 or higher). *This feat is presented in the Nonepic Feats section at the end of this chapter.