My Dhampir system

Hundred years ago...strange life forms from an unknown planet, known as echidal a human like creature with four arms and two head, invaded earth. It was like a nightmare when they appeared guns, barrels, missiles, nuclear bombs all became useless but not entirely useless, it was at least able kill the weakest one among them after lot of effort.
Oliver twist an orphan with weak ability, was beaten to death by his peers, his fate turned around when he found a system that turned him into a Dhampir granting him immeasurable strength.
He completed quests after quests, growing stronger proving to the world that a nobody can be somebody.
Read as oliver twist rose above the world that once destroyed him making those who wrong him pay with their bloods.