Fiendish Strikes Feat 13
Source Pathfinder Advanced Player's Guide
Your festering connection to the forces of evil infuses your weapons with debilitating malevolence, tearing down creatures of good with every attack. All your weapon and unarmed Strikes gain the unholy and magical traits.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
NephilimA creature with this trait has the nephilim versatile heritage. Nephilim are planar scions descended from immortal beings from other planes. An ability with this trait can be used or selected only by nephilim.