Holy Subdual
(Book of Exalted Deeds, page 44, DnD 3.5)
[Exalted, Fighter Bonus Feat]
You can turn bonus damage into nonlethal damage.
Prerequisite
Subduing Strike
Benefit
When you use your weapon to deal nonlethal damage, you can also transform bonus damage from a holy weapon, your smite evil class ability, or your smite granted power into nonlethal damage.
Special
A fighter may select Holy Subdual as one of his fighter bonus feats.