Champion Concept: Xer'sha : The Void Voyeur

So I've noticed that there isn't a void champion designed for the support role yet and this champion is designed to address that. Xer'sha is a control mage that survives off of her use of portals and force fields to escape or fight her foe. I'm not a writer and honestly can't think of a visual description or backstory for the character so this is more of a way to bounce off kit ideas.

As an idea for a passive I was thinking that Xer'sha could use a very small portal to briefly access the fountain shop from wherever she is on the rift once every three levels or so.

As a Q she could also have the ability to create a dome-like force field over a location for a short time that neither allies nor enemies can escape. Xer'sha runs off of an energy resource and can hold the barrier while constantly depleting her energy or choose to quickly release it. At higher levels the rate of energy used decreases and the base cooldown decreases.

Her W would need a damaging ability with a short cooldown as it's her only damaging ability.She would shoot two consecutive waves of force fields in the direction of her choice, pushing back all enemies a very short distance and damaging them costing a flat amount of energy.

Her ultimate ability would act much like a portal gun. Xer'sha would shoot twice for both ends of a portal in the form of a skill-shot for anybody to go through. This skill-shot distance is about the same distance as Xeraths Q. This ability costs a flat amount of energy upfront and more energy the longer the portal is open. This has a moderate to short cooldown.

I'm not sure about what her E would be yet, but I like the idea of her being able to be a control/support mage being able to push enemies through her portals (if properly timed) and save her allies in a quick pinch with her force-field dome. If anybody has any ideas or criticisms to contribute I would appreciate it, thanks.