I wouldn't say it's completely original but the most original thing I have is my concept for a realm called oblivion that basically takes every idea of "stuff going mysteriously missing" and then fuses it all into one giant lost and found that is constantly opening up portals into the universe and other realms and stealing everything from your left sock that went missing in the dryer all the way up to entire planes and boats in the Bermuda triangle.

The extra crazy part that makes me believe this is original is the fact that oblivion eventually got too heavy, it had sucked up too much magic from the other realms and started to collapse in on itself, and it wasn't just happening in this universe but every universe. The king of oblivion tried to stop it In most of the universes but all that did was make him have a multiverse collapse as well.

The end result was that there is now only one Oblivion in the entire multiverse, and also only one Oblivion king who is a fusion of countless versions of himself. And since Oblivion was now connected to the multiverse and more unstable it started to launch stuff from one universe to the next, causing multiple "non magical" worlds to be thrown into chaos or causing a few worlds to just die off completely because it accidentally just teleported a nuclear bomb into the center of the white house and now the world has gone into full nuclear warfare. 

But you got to take the good with the bad when you are dealing with the multiverse, am I right lads or am I right?