So, I'm kicking around a build for a rather fanatical zealot of an inquisitor (or similar class) with the diehard belief that there is evil in everyone, and purging that evil is the only way to purity. Mechanically, I was planning to have him use the Undead Domain power to give targets the positive-energy vulnerability of undead, and then beat the pulp out of them with holy light.
Are there any other ways to give people Negative Energy Affinity against their will? Inquisitor doesn't have as much positive-energy blasting as I'd hoped for at first blush. My first thought was to get a Sacred Servant paladin to get the domain from an Empyreal Lord, because so many of them have weird subdomains, but no ELs (or, for that matter, non-evil gods) offer Undead.
Who says you need to be good?
Pick up the Infiltrator archetype and cast good-aligned spells for days.
I'd like to be good (or at least, worshipping a good deity), though it's certainly not a requirement (he undoubtedly thinks of himself as a paragon of righteousness and holiness).
My real question is on mechanics. Is there a way to do it that doesn't require taking that domain? While he's no hero, it doesn't make a whole lot of sense to worship an evil death god, but still be on a "holy quest" to purge peoples' "inner evil."