The Neodymium Chronicles

Lem’s a mace-wielding teen space-ninja in a universe of sentient insectoids, purple jungles, and insane electromagnetic fields. She solves most problems by hitting harder, and never plays by her enemy's rules - until Jared Diebol captures her. Diebol is the rising leader of an army uniting the galaxy by force. He believes that the violent energy being Njande has “contaminated” Lem and her friends from another dimension to conquer the matter-based universe. Diebol’s army usually kills contaminated people - but he vows to cure Lem. 

On a normal day of interplanetary sabotage, young Jei Bereens has things under control. He's plagued by night terrors and an archenemy as slippery as the grime on his gun, but freedom fighters all around the galaxy look to him for help. He's got the favor of an energy being and a best friend who'd die for him. On a normal day, Jei is legend. Today is not a normal day. Today, Jei broke an enemy soldier's mask and found his best friend inside. Tomorrow, that best friend will sell Jei out in the name of saving the universe. And the next day, Jei will disobey orders to take her down.