Concept: A group of automatons once designed for a Great War saw the devastation that biology/humanity inflicts on the land and, disgusted, went AWOL to make a positive change. Many decades later they reemerge with an arsenal of old world technologies and war machines augmented with new and outright paranormal upgrades for one purpose: ensuring order, peace and the disarmament of all things obscene.
Their numbers were once great and their army was well equipped, but an internal schism has left the dominant faction crippled and forced into hiding. During that schism, the that side believed in world peace through assimilation, harmonious unity and lobotomization of biology won and eradicated the usurpers, but with devastating losses. Their grand goal is to disarm and pacify enough biology they deem necessary before forcing the Earth to 'Begin Again' without the corruption and debauchery that the sinful humans brought to it.
In the current day the faction is still in hiding, but many of their currently stranded units on the surface still remain, carrying out their duties without guidance. Dreadnoughts conducting solo pacifying gas bombardments, lost platoons on the lookout for new souls to save, automated war peace machines, all of their anomalous objects/beings are designed with advocating peace in the most hypocritical and usually offensive way possible.
tl;dr war veterans turned into hippies. So what do you think? I was working on a few RPCs with the themes of peace/violence/hypocrisy when I thought it might be worth pitching as a GOI.