Nails of Helena

Ability
The Nail's power boosted the users regenerative powers and allowed them to "charge" there bullets with holy fire capable of grievously harming undead and all "unholy" creatures; these flames were easily extended to all of Demon's familiars all at once, fatally igniting them. Familiars killed in this manner included Goblins, Succubus and other unholy familiars. It was also able to near-fatally wound High class demons with one of his blessed bullets, nearly cutting him in half with a single blow.

Story
Helena's Nail actually refers to any of traditionally 3 different nails, though from the same source. They are the nails used in the crucifixion of Jesus Christ upon the "True Cross".

The nails are objects of veneration among some Christians, particularly among Catholics. They are among the Arma Christi, otherwise known as the "Weapons of Christ", which are commonly associated with Jesus's Passion. Legend states that the nails and other remnants of the True Cross were discovered in Jerusalem around 313-327 AD by Saint Helena, mother of Constantine the Great.

She left all but a few fragments of the Cross in the Basilica of the Holy Sepulchre in Jerusalem, but returned with the nails to Constantinople. One of the nails is said to have come to rest in the Iron Crown of Lombardy. It is also said that Helena placed 1 of the nails in Constantine's helmet (which is said to have become part of the Iron Crown of Lombardy), 1 in the bridle of Constantine's horse, and 1-2 into the Adriatic Sea to calm a storm (or 1 into the head of a statue). This may not be true, however, as there are many conflicting stories.