The YE system divides itself in two different sub systems, Dark Fantasy and Storage, both are unique on their own way and have their own set of posibilites.

Storage is based on putting an object in another dimension that they can bring out wathever they want.

while Dark fantasy creates a mass that can switch betwen tangible and untangible but the mass moves by itself in a unique way for every user.

What I find more interesting in YE is when characters use both sub systems together to create unique effects.

My favorite example of both subsytems being used together is with a character that can use Dark Fantasy to make him insanely fat for long periods of time to then store with storage all this "fat", allowing him to become extremely agile and strong and to put all the "fat" that he stored in a single point of his body to make them gigantic.