I'm a necro/mage and my necro is 38 but I raise it to 55 with jewelry, and my SS is 64. I can't seem to find a good way to raise it. Almost all the spells seem useless to me now. I can raise my Magery easily but can't raise necro. What is a good strategy for raising it? What spells should I cast and on what? should I ditch the jewelry?