The Cyanites have a way of turning up every time I create an urban adventure environment. They're the guys in robes who process through the neighborhood at night with little brass bowls of cold blue fire, chanting quietly to themselves in a lost tongue. The PCs have never heard of these guys before. What they're up to has nothing to do with whatever business the PCs are currently engaged in. But if the PCs are curious enough to follow or dig deeper, they'll discover a secret that's at once strange and compelling. I haven't figured out exactly what that secret is because I've never had to. For one reason and another, my PCs have never run into the Cyanites. They remain that bit of prep that I've never needed to use. Some day.