Quote Originally Posted by Kish View Post
Not possible. One must override the other, unless murdering a fiend could be both good and evil.

There is no way to prove, by the letter of all the rules published for D&D, which one takes precedence.

The question is, which makes more sense? That killing a succubus paladin would be a good act, or that murder is always evil including when it's the murder of a creature with the Evil subtype?
TBH I'm not even sure that the succubus paladin is legal. I know that at least some of those Fight Club monsters were illegal. I'm honestly not sure how to look at knifing her. I doubt even the force that granted her power would be quite sure how to call that one. In the other 99.999999% of cases I personally think that the fiend ganking wins. Even with D&D's absolutist alignment system some things are gray.