Improved Manyshot

 
Prerequisite(s): : Character level 21+, Dex 19+, Base Attack Bonus 21+, Many Shot, Point Blank Shot, Rapid Shot
 
Benefit: As Manyshot, but the number of arrows the character can fire is limited only by his or her base attack bonus (two arrows, plus one arrow for every 5 points of base attack bonus above +6).
 
Special: Regardless of the number of arrows the character fires, he or she only applies precision-based damage (such as sneak attack damage or the ranger’s favored enemy bonus) once. If the character scores a critical hit, only one of the arrows deals critical damage (character’s choice); all others deal normal damage.
 
Source: Epic Level Handbook