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Balance 
When i read "you can have as many [summons] as you want".. would i download it? Some would i guess, sure, but mods that literally break the game, what with balance going out the window, not most people's thing. So that's one.
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Start small or at the least compartmentalize?
A 'summon skeleton' skill,
just one, assuming it scales only with necromancer ability and not with int (and assuming no double-dipping or other OP stuff) is a welcome addition; can't understand why they left this out.. major disappointment, lol
Or perhaps a 'shout' that once every day (think rarely/loooong CD) allows you to use the "Summon Bloated Corpse" skill without a corpse nearby?
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Start conservatively ^^
The game has a million different abilities as it is;
unnecessarily bloating it further is almost by definition a bad thing to do.
p.s. not the kind of feedback you expected, i know; feel free to discard it
