I am at level 42 for combat magic, but many of my spells do not seem to work. Explode Body and all of the summon spells have no effect if I try to cast them. I should be at a level where I can use these spells. Am I missing something? Is there a certain way they need to be used?

I am playing in multi player mode, but I don't know if that makes any difference. Any ideas?

Thanks