So these little ladies are about a step away from being werespiders. An aranea is a shapeshifting magical spiders, with a unique humanoid form, one beastly form and a third form being somewhere in between. Though not good, these creatures aren't evil, which is something quite pleasant when it comes to sentient spiders.
I just really dig the idea that the little old lady in the house down the road that makes extra nice sweaters has a bit of a secret. But that doesn't mean she'll eat you. Well, maybe she will. Villagers probably get the ol' torch and pitchfork when they find out about that. They've still got a good bit of poison, spells and sticky webs to gather you up with. So just be a dearie and keep Grammy Spider's secret, okay?