Fan Casting Merlin in Shining Knight

Grants Justin the magical armour and sword as well as the usual transforming the horse into basically a Pegasus once he has been freed? Perhaps is imprisoned by Morgaine Le Fay? Gives not Superman level physical abilities to Justin but more like Captain America? Justin is also given longer life by Merlin so that he can continue to fight against Savage? The Black Knight wounded Justin and he doesn't know Merlin did this whilst healing him? Maybe Merlin has encountered Vandal Savage before and Savage reveals himself to Merlin? (We see it from behind with no clue though) Explains to Justin near the end that the Black Knight is an alias of an old enemy and proceeds to explain