I like it.
Though, I only mentioned 'vampire strength' because they remind me of vampires (undead, enhanced attributes, maintaining sentience). They look like vampires (beauty-wise), but don't suck blood. Maybe change it to Undead Knight, so onlookers aren't confused?
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)