could the magic cueball be representative of trauma?
vriska inherits her cueball from mindfang, and she blames her loss of luck on the cueball exploding (in the same way mindfang started using the cueball once she ‘lost her casino’ - read: gamblignant generational trauma?). rose enters her grimdark state after asking the cueball questions whose answers she wasn’t ready to understand.
this would obviously have a lot to say about the cueball’s unexplained presence in jade’s room from the beginning, but there are people who are probably much better prepared to talk on that point than i am.