After Humanity became a type one civilization, they realized just how little they knew about the Cosmos. As if they had passed some sort of test, humans had gained access to to a strange Energy called Mana, allowing them to advance greatly in an extremely short amount of time.
Technological advancement was just the start. People could use this Mana to perform magic, allowing them to strengthen their bodies and do all sorts of other incredible things.
Then there is Nux. Somehow, he had absolutely no Affinity for any sort of magic and was thus incredibly weak. So much so that a toddler could toss him like a ragdoll. He is an Orphan and thus has to take care of himself.
However, things suddenly change when an event that is meant to be extremely tragic turns out to be a life changer for him, and thus, he goes from a nobody, to the Herald of Chaos.