From publisher blurb:
As its last act, a dying alien guardian hands over her bands of power to a human, charging them with defending the innocent. A young woman discovers an ancient sword jutting from a stone. She pulls the blade free from the rock and thereby accepts her destiny to defeat an ancient evil. A teenager mourning the loss of their parents stumbles upon a strange costume. Upon putting it on, they discover they now possess superpowers but with no knowledge of what those powers are or how to activate them save through trial and (lots of) error.
In superheroic settings, fantastical events can see the average, ordinary person finding, acquiring, stealing, or inheriting something like a magical sword, a suit of power armor from the future, or a ring that connects them to an organization dedicated to galactic peace. When the individual accepts this power—and the responsibility that accompanies it—they join the ranks of many people before them to become a legacy hero.