I've just started playing through Dawnguard and I've decided to go with the vampires this run through. When harkon was telling me about the spells he said I could raise dead with my left hand but every time I try the spell fails, like I have no magicka. I've tried everything I can think of, unfortunately I don't have a save prior to this problem.
I also started picking up new spells through the perks for that hand and the only one that works is the vampiric grip spell. Summon gargoyle, raise dead and the other spell don't work for some reason. Any help?
Also, in case nobody noticed the title, I'm on Xbox.