Feat: Blessed Blood (Nephilim)
Your spilled blood is sanctified, with effects similar to those of Holy Water. Whenever a fiend, undead, or creature with a weakness to holy drinks your blood or deals piercing or slashing damage to you with jaws, fangs, or a similar attack, that creature takes 1d6 spirit damage with the holy trait. You gain a +4 circumstance bonus to Crafting checks to Craft holy water using your blood as one of the ingredients.