Veilwar
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enchantment is a good choice for a second opposed school.
false focus, from inner sea magic, may be a good feat choice. using a holy symbol worth up to 100gp, you can ignore casting costs of up to that much. its a modified version of eschew materials, better in some ways. great for when you need to use 100gp of onyx but dont have any at hand.
caster level is the most important thing you can have, it effects many things including concentration checks. every caster level you miss means your effectively playing one level lower than the rest of your group.
now, if your serious about being a lich, you may want to consider being a sorcerer instead, as they use charisma to cast. necromancer is only better if you want the extra HD of undead control that the specialist wizard gets.
I didn't think about the Sorcerer. Maybe the Sanguine blood line to pick up the increased caster level when casting Necromancy spells?
