Necropolis versus Academy.

Damn, does nobody actually read my posts here? I wrote it in plain Russian that the mage will also have all these artifacts, and he's looking for the Staff of Sar-Issa, meaning there will be no resistance. It won't affect the Arcomage, but it will affect the Necromancer.

Staff of Sar-Issa
Ignores creatures' resistance to magic, however, magic defense and magic immunity will still be in effect.

Do not confuse magic defense and magic resistance. For example, magic resistance of 25% means that with a 25% probability, magic will not affect the creature at all, while magic defense of 25% means that the damage dealt by magic will always be reduced by 25%.