Melody of the Void
Collage of Witches Bard
Both species (Celerine: Rabbit) and Subclass are from the #DelversGuideToBeastWorld
Her homeland Trait gives her the innate ability to create a burst of darkness to defend herself. Sadly she wasn't raised there, the whole campaign happens in a different universe, so nobody could explain that those aren't demons lashing out through her.

I also don't think she could put that together herself until now, I rolled very badly for at least 1 stat and she is, in terms of classical school knowledge and logic, dumb as a rock (Int 5).
Same as a Mimic, Ogre or shambling mound.

So yeah, she will probably not solve the math puzzle the intended way, but maybe she can ask one of the local ghosts for help.  

She has the eldritch adapt feat, I guess she somehow out charmed some fiend or cosmetic horror beyond her comprehension, without ending in a pact.

Or maybe some powerful entity was just worried for her letting her live in the illusion that she bested an otherworldly being  

Either way, the ability to create a small crack in the fabric of reality to unleash a concentrated pulse of untamed energy at a target surely comes in handy sometimes

The class also gives her the option to play a little concert for the local ghosts and recruit some for the rest of the day. She still has to rock the roof off of a haunted house