"Cars, no, but I've seen a motorcycle or two. Not that their owners are likely to part with them," Devin said, putting pressure on his thumb to stem to bleeding, slight as it was.

He shrugged lightly. "In this particular instance, it's simply an additional identifying marker, should my name prove to be insufficient. If wards are person-specific, that's often the easiest way to demarcate accurately," he explained. "There's nothing especially unique about my blood, other than that it's mine."