Irresistible Force Paradox

Stiles is the immovable object, he's set in who he is.Enter Andrea who used to be an unstoppable force, comes bearing a warning, is hellbent on setting herself right and is here to help but more likely to die. There's a new enemy coming not for the people but the place yet won't mind 500 000 lives worth of damage. It'll be a summer to have nightmares about. Post s4