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Blade of the Crimson Oath 
Feat 12
Source Pathfinder Lost Omens: Character Guide
Prerequisites Knight Reclaimant Dedication
You call upon the Crimson Oath to smite undead and then make a weapon or unarmed Strike against an undead foe. The Strike deals two extra weapon damage dice, and you can convert all the physical damage from the attack into positive damage.
Traits
Common
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.
ArchetypeThis feat belongs to an archetype.