Fantasy

In a dead world overrun by walkers, Gray gains access to a system capable of buying almost anything: weapons, skills, powers... even abilities from other universes.
    At first, surviving The Walking Dead seemed simple enough.
    Then he discovered Rebirth.
    A feature that allows him to travel between worlds while permanently keeping some of the powers he earned.
    Now, every apocalypse, every universe, and every battle is a stepping stone toward something far bigger.
    And Gray plans to survive them all.
    First time doing this, so don't expect award-winning writing.
    Might also mess up timelines or places but just take it as an AU :)