| I like this. It's clear that you put a lot of time into it, and I definitely appreciate the clear formatting and professional presentation.
Here are my notes so far (more later).
Shadow Shield (level 2 utility spell) seems too much of an obvious choice. An encounter power that grants a flat bonus to AC for the rest of the encounter? There's no real encouragement to use this power tactically. You're shooting yourself in the foot if you don't launch it off as fast as possible in every encounter. I'd rather see it as a daily power that grants an AC bonus for an encounter or as an encounter ability that is maybe not so statically reliable.
Enduring hex (level 3 encounter). What does this power do? From what I read it looks like it only inflicts damage once, then is over. What is supposed to endure?
Siphon Life (level 2 utility). For a power that can only be used once per day, I would wish for this to be more beneficial. You already spent a healing surge making that minion, so to destroy it just so that you can spend another healing surge with a bonus to the healing seems not worth it. I say give the Necromancer the healing surge from the minion back as a spent surge plus bonus healing. | 
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