Necro call can be very handy to use against a hero that cast himself necro call or can be useful if opponent has many necro stack. Other than that I didn't use it a lot.
The level of raised creatures isn't the same but dependent of the dead creatures level. For example all Archer will involve undead Archer. I didn't notice any random there, once you know what type will be raised you can predict what you'll get for a given dead stack. For what I quote the spell level only increase the max leadership raised.
Book of Evil is worthless for me because of spells like lightning, that's very unpleasant to see your book kill many of your creatures.
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