Divine Hunter Bond | Pathfinder Wrath of the Righteous Wiki

Upon reaching 5th level, a divine hunter forms a divine bond with her ranged weapon. As a standard action, she can call upon the aid of a celestial spirit for 1 minute per paladin level.
At 5th level, this spirit grants the weapon a +1 enhancement bonus. For every three levels beyond 5th, the weapon gains another +1 enhancement bonus, to a maximum of +6 at 20th level. These bonuses can be added to the weapon, stacking with existing weapon bonuses to a maximum of +5.
Alternatively, they can be used to add any of the following weapon properties: axiomatic, brilliant energy, flaming, flaming burst, holy, keen, merciful, and speed. Adding these properties consumes an amount of bonus equal to the property's cost. These bonuses are added to any properties the weapon already has, but duplicate abilities do not stack.
A paladin can use this ability once per day at 5th level, and one additional time per day for every four levels beyond 5th, to a total of four times per day at 17th level.