Board Thread:Speculation House/@comment-10390252-20141218201832/@comment-11188061-20150212013318

Blatant parallel universes are rarely good writing material, because it's either 'awesome' or 'so-fail-no-one-bothers-to-read-them'. There's also that thing called 'removal of consequences' which may invalidate any forms of loss such as death.

Which is my way to say that writing RWBY featuring parallel universe as a theme, unless you're a net famous author or really, really good (which will eventually make you a net famous author anyway), don't.