Interdimensional travel station

This is where you can go to other universes such as you can go from the mario universe to the sonic universe There is one in every universe however to go to the other dimension you must fight a powerful opponent from the universe your currently in like if you are in mario universe you'd have to fight dry bowser.You can go to the dragonball z roleplaying wiki but you got to get through zero,masterman64s charecter.