Maybe the 8th witch will be Robyn. How old would she be now? Maybe 15?
As @PantheMan says, maybe something to do with the directional witches in Oz. I am hoping that it is the 8th witch in the Mills family tree, but I don’t think the writers would do that, unfortunately.
However, either of these could be fun as far as I am concerned 🙂
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Keeper of Regina's bravery