I've been working on this new overarching plot idea for a bit now, sort of letting it stew in my brain. It's been 300 years in the making actually. And it works into both Graves and Beyond.
It explains why some of the weirder stuff has been happening.
( Essentially put: )So. What does this all mean for the game?
Your characters could quite possibly develop a new, peculiar type of magic. Among other possibilities: this extra magic is affecting how things work, making things that were improbable more possible. It's not only affecting mages but magic itself. There are a multitude of ways this could be played out.
It's not necessarily all inclusive, but if you have a character who needs something interesting to happen to them this might be the plot to jump on. It's up to you how you want to play it, however it won't be explainable. While your characters will know something weird is happening they won't know why or how. So if you want, hop on the crazy train.