A Nichirin Shotgun that can be used when you are far from your enemy/target or ranged (available to humans).
The Nichirin Shotgun can have its normal bullets, normally damaging the enemy. And if the enemy is a demon, you can switch to wisteria bullets. Which poisons the demon enemy for a bit of time. Giving you an advantage. But you'd have to work for the shotgun, getting the necessary amount of money and objects to craft it (sorta like demonfall).