Part One: The boxs

Seven was always a lucky number.
Seven powers means seven heroes.
Seven teenagers.
Till something strange happens.
Eight powers are given out.
Eight heroes.
Among those are Shelby and Ross. Two cousins from poorer families.
Jin and Sky. Two guards for the king.
Aphmau. A girl from a decent family.
Max. A hothead orphan.
Corey. A thief with a past.
Finally a cloaked person who refuses to show their face and nobody is sure who they are.
The Eight have to work together to fight against evil. But they can they move past their differences to do so?