How works Necro Call?

[ArkhanTheBlack]

With int 30+ and perhaps the lightning bonus I remember in normal mode to have pain to find where cast a lighting without to hurt my troops at beginning of a battle.

Not sure if it's dependent on the spell level of the lightning spell, but at the moment, a lightning can't pass a three fields gap.

I'm looking to use some alternate with High Magic like book+stoneskin, book+teleport or book+Divine Armor.

That won't work, because they are immune to spells. However, this also has the advantage that you can cast area damage spells on enemy units in combat with them, and they don't get hurt.