Soul space, soul essence, wraiths and so on, in just this one night, Blake had been saddled with both theoretical and practical information on all of them, and now as he stood in Lena's mind space staring once more at the exotically beautiful white-haired woman in tight black dress she had become he could only think about how troublesome his current situation was.
From the information Blake had been provided with, he understood that while the eternal pact conquered the soul, mind and body and made them all loyal to him, the soul mark conquered just the soul and body and though the soul was the basic building block of a person's existence, the mind and body were the drivers and executioners of that existence.
Of course, if he had a stronger will which translated to mental power Blake could more efficiently control those who had been marked, but now with Lena having a will that superseded his currently usable will, Blake knew she would be more than a handful.