Voidwitch Saga

Before she escaped in a bloody coup, Mephisto transformed Mariam Xi into a deadly voidwitch. Their training left her with terrifying capabilities, a fierce sense of independence, a deficit of trust, and an experimental pet named Seven. She’s spent her life on the run, but the boogeymen from her past are catching up with her. An encounter with a bounty hunter has left her hanging helpless in a dying spaceship, dependent on the mercy of strangers. Penned in on all sides, Mariam chases rumors to find the one who sold her out. 

Mars Xi is a living weapon, a genetically manipulated psychic supersoldier with a body count in the thousands, and all she wanted was to be left alone. The last time MEPHISTO came for Mars, they took one of her friends with them. That was a mistake. A force hasn't been invented that can stop a voidwitch on a rampage, and Mars won't rest until she's settled her debts.

Mars Xi is on the run, a bounty on her head and a kill count on her conscience. All she has left are her mutant cat Ocho and her fellow human weapon Pale, a young boy wracked by seizures who can kill with a thought. She needs him treated, and she needs to escape, and the only thread left to pull is her frayed connection to her father, Marius Teo. That thread will take her to the outskirts of the galaxy, to grapple with witch-cults and privately-owned planets, and into the hands of the man who engineered her birth.