Hundreds of years ago, humans discovered what they used to call "Magic". Though that word was twisted through many years, reaching the current state of "Energy", it still holds the same definition: Power. Every human, every animal, being or even object, from the tiniest molecules to the biggest black holes, all have energy. Objects are in perfect balance of positive and negative energy, creating perfect neutral energy. Humans and all living beings have an uneven amount. Constantly chasing an impossible balance. The more harm you do, the more of your energy is negative, vice versa.
But there are many more variables to what energy one may posses. The quality, the quantity, or even what you can do with it. All are born with equal potential to reach the highest peak of humanity, but not all are given the same paths to that peak.