Supreme Many Shot
From D&D Wiki
 Supreme Many Shot [ranged feats]
your ability to shoot a hand full of arrows is now rediclous
Prerequisite: many shot, greater manyshot, point blank shot, rapid shot, dex 21, bab +8
Benefit: when using manyshot you may now make irrative attacks, each extra arrow added to your normal attacks is a -5 to that attack. if you have a bab of 16 your 4 attacks would be +1(4 arrows)/+1(3 arrows)/+1(2 arrows)/+1(1 arrow) instead of +16/+11/+6/+1 (1 arrow each)
Normal: normaly you can not make irrative attacks as many shot is a standard action and manyshot usually is a -2 for each arrow fired.
Special: when using this feat to manyshot with a full attack it replaces the negitives manyshot usually gives.