[quote=@Estylwen]
The real question is how he got Dremora's in him. They don't mate with other races. I'd say they don't mate at all, monsters and demons are just spawned in whenever there's a mortal birth. Most likely, how he got his Dremora powers is if he was cursed by a Dremora, (or blessed, depending on how you look at it.) Would that fit with your vision?
[/quote]

That works too, mostly needed a reason to explain the shadow powers and Dremora seemed to fit, a curse/blessing would work