I have been working towards a sneak build that uses illusion magic in one hand and a dagger in the other. I just now got my Illusion master spells and I was disappointed to see that all of them were dual wield only. Is this how all master level spells in the game are or do I need more magicka or something? Was really hoping that dual spells was completely optional, but it seems it's not. I might just downgrade to expert spells.