Wow nice guide thanks! Will help my HxC necro summont there!
Dont forget to say that Iron golem can be made in a item to give an extra aura, and this golem stay still until it dies (so even if you leave game, you ll keep that golem !!!)
This said, a unique sword gives might lvl 5-8, and a 2 hand unique axe gives about lvl20 might (i cant remember names sorry) this can add cheap aura for necros Cheers!