Board Thread:Lore Discussion/@comment-99.120.249.161-20140404041838/@comment-5115051-20140407181209

Also, the fact that the Old Dragonslayer does dark damage, but his spear does lightning damage should be noted.

It makes much more sense (to me anyway) that Ornstein was revived and possibly changed/corrupted, rather than "maybe there was some overly complicated reason that was never even hinted at that made Gwynevere want to make someone just like ornstein."

Bottom line - if he looks like ornstein, fights like ornstein, has the lightning imbued dragonslayer spear that was used against the dragons (aka - Ornstein's spear), and Ornstein's ring, I'm going to assume it's ornstein.