Geezer Ridire:
Are there lycanthropes in this game? I'm asking because I came up with an aspect for my steed called St. Christopher's Metal, intended to repel them.
In short, there can be anything in the setting that we want, with the general guideline that it should fit the established tone. And Aspects are explicitly a tool that you can use for world building, so if you want to create an Aspect about dealing with lycanthropes, that establishes that lycanthropes exist in the world.
In even shorter, if you want them, then yes they exist.
(maybe that's who will be the Jackals of the Street?)