What is Quintessence?

I am doing a report on Quintessence and I cant figure out how to describe it. I've read something about it can be found in lightning? It's the stuff of life, something about dark energy? There is this television show called W.I.T.C.H where five girls have the power to control water, fire, earth, air and... show more I am doing a report on Quintessence and I cant figure out how to describe it. I've read something about it can be found in lightning? It's the stuff of life, something about dark energy?

There is this television show called W.I.T.C.H where five girls have the power to control water, fire, earth, air and quintessence. The girl who controls quintessence can shoot lightning and make things come alive??

So what exactly is quintessence??
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