Chronos #10 (1998)

Revisionary -  Walker Gabriel's adventures shift into high gear now that he has ceased to exist! Stranded in Chronopolis with the only two people who remember him, Chronos takes a dangerous assignment: retrieving a mysterious device called the Forever Engine from the distant past. Traveling to the Byzantine era, he finds the Engine in the hands of the Order of St. Dumas (as seen in Azrael ). If Walker can retrieve the Forever Engine, the reward will be the fulfillment of his fondest wish: learning the present-day location of his real father. But is the prize worth the damage the Engine will do to the timestream?