Dogbrain said:
Any campaigns out there have the idea of war as an evil act but one that may be unavoidable? All I've seen is that "war against evil things" is portrayed as a positive good rather than a necessary evil. How would this alter the "vanilla" fantasy setting?
I haven't used this concept in any of my games, nor do I expect to. If war is an inherently evil act, that means that the nation defending itself from invasion is evil, merely for not wanting to be conquered and pillaged. Or at the very least, that for a nation to defend itself is considered an evil act. My personal moral outlook finds such a concept repugnant, so I'd be hard-pressed to use it in a game where I am the DM.
In regards to "vanilla" fantasy (whatever that is), I think that a campaign which uses the concept would ultimately be as affected or unaffected by it as the DM chose. It might cause all warriors, attackers and defenders alike, to be viewed as an "untouchable" caste, necessary to perform an unpleasant task, but shunned because of it. Continually performing an evil act would have a high chance of moral corruption, so warriors may tend toward LN or LE, even those defending good nations. Even if that is not the case, warriors might be feared because of such inherent corruptibility. Fathers would fear for a daughter's soul, should she choose to marry a soldier.
In such a campaign, the concept might seep even further into the structure of society. Nations might keep slave-armies, so that the evil of war need not soil thier own hands (an extension of the Untouchable Caste scenario). If war is considered evil, even if necessary, then lethal self-defense could well find itself in the same position. This would create a world with a lot more martyrs. Moreover, merely carrying a weapon would then carry the taint of evil, because it would represent a willingness to commit an evil act. That said, the taint could spread to blacksmiths who craft weapons of any sort, since they are connected to evil by association (like morticians are connected to death via their trade.)
There might also be a psychological impact. A full-scale war would mean, among other things, that an entire generation of young people from two nations would be burdened with the guilt of knowingly commiting an evil act, and having a taint on their spirits. Those that refuse to go to war because it's an evil act might well feel like traitors to their country.