This story takes place in a futuristic world. Two, in fact. The first of these worlds is the Earth we know and love, where human technology has advanced beyond our wildest imaginations. Sadly, our technological successes were still no match against natural space disasters, namely meteor apocalypse.
When a stray, planet-sized space rock decided to pass through the asteroid belt, it bumped a few thousand meteors out of orbit. It was only a matter of time before the lethal projectiles were discovered on their one-way track to Earth, and seeing no way to destroy the threat, humanity decided to flee from it.
Their voyage took them to our second planet, a verdant, fertile land they christened Alternia. At first things went well for the new settlers as they began to deforest and excavate the land to fit their needs, but as time went on it became apparent to the humans that the native fauna weren't too happy about their activity.
The Lusiian, which was the name given to classify all the alien animals, were a unique form of life. Unlike the animals from old Earth, every lusus was stark white with green eyes, yet their blood could come in a rainbow of colors. They came in all shapes and sizes, but the most fascinating, and most dangerous, aspect of the Lusii was their unimaginable power.
The settlers took to calling it the Green Lightning, which was appropriately fitting. If a lusus was attacked or angered it would undeniably annihilate the threat with a bolt of green energy. Another lethal skill of theirs was the ability to manipulate matter and space. Many a human would mysteriously vanish in the presence of a lusus, only to be discovered weeks later- dead.
At this the humans began to retaliate. They knew it was futile to fight the unholy menace, so instead they went on the defensive. After years of failed attempts and numerous more casualties, the settlers managed to succeed in building a shield impenetrable by all things solid and of high energy with their vast knowledge. But this shield was like a two-sided coin. While it managed to keep Lusii out, the humans were also trapped in and this created new problems of their own.
Desperate for the need of expansion the humans once again began looking for a solution to keep their Lusiian enemies at bay. This time their answer would attempt to take the Lusii's power and turn it against them in a form of hybrid-human race whose sole purpose would be to be used as living weapons of war.
And this is where our story begins.
I have a general sense of where I want to take this, but no idea how to get there, so I'm just making it up as I go along.