Arrow:The Lost Saint

A crossover with reinhard becoming the green arrow:
"After a tragic accident at sea, billionaire Reinhard Vanastrea is discovered alive five years after being presumed dead. But the boy who disappeared is not the man who returned. Hardened by his time on a hellish island known as lian yu and driven by his father's dying wish, to save his city from those poisoning it he must become something else-someone else-to save his city from those who would destroy it.