[X] Spiritual
[X] Establish Annual Festival
[X] Lure the nomads deeper into People controlled territory and launch a massive ambush
[X] Send a diplomatic expedition Into the Wild in the hopes of finding someone who can help
The way I see it is this:
What social values do we really need to change? Eye for an Eye has its issues, yes, but it is easily manageable and otherwise beneficial.
Thus the question lies between military and spiritual matters. I've got no preference at all, really, so I'll edit my vote later as I think on it or new arguments pop up.
Everyone seems to be voting for the festival. This is good. This was our plan was to main action a festival. We essentially completed a generations long project. Let's celebrate it for the rest of time. This should cover multiple benefits, both spiritual and societal. Upgrading our spirit place also sounds useful, but to me, it seems a rather poor reward to our people who worked so hard.
The lure idea is practically obvious. We just got some serious business bonuses there. Let's use it.
I'm not really sure what to do about this option. I don't like just rolling the dice on an encounter. However, I feel we need to root out the Storm Clans, and I'm not willing to approach the Spirit Talkers to do it. We already know they would take serious issue with us. If we have no other choice, let's just roll the dice.