Talk:Dragonslayer Spear (Dark Souls II)/@comment-24701196-20140407003107/@comment-68.63.225.156-20140630221321

I'm 99% certain that the Old Dragonslayer is just one of Ornstein's knights that got corrupted by the Abyss. He's significantly weaker than Ornstein, he's who-knows-how-far-away from Lordran (in a place where dragons are virtually common, albeit only encountered in a certain area), and he doesn't show any ability to use his spear's lightning damage.

Given that you can find Allone Knights in Castle Drangleic (amongst other oddities across DS2), it's entirely possible that the Old Dragonslayer was a mercenery member of Ornstein's dragonslayers hired by either the Blue Sentinels (possibly to test potential recruits or protect them from the BoB) or by the inhabitants of Heide (to guard the cathedral as a whole).