Oh woe to the Neutral Cleric

[Mephit]

In a pile of loot my party found a sword called the Apathy Whacker. It was a +2 Longsword that dealt +4d6 damage to true neutral creatures with an intelligence of 3 or higher.

How many times do you come into conflict with TN NPCs?

If your DM doesn't allow divine metamagic.(a very sane choice)

There's nothing inherently broken about Divine Metamagic. It's powerful, but not gamebreaking. It only gets stupid if you're allowed to stack Nightsticks/similar shenanigans.