User blog comment:999killshot99/What is the best Necromancer Item set up?/@comment-2154860-20160616114131/@comment-2154860-20160617195506

It's a nice armor, but that won't help you much by act 3 Nightmare. Sheer defense isn't going to prevent you from being hit unless it's accompanied by a level 20 Defiance aura. And later on, you will probably also get frustrated by your inability to hit enemies.

You can also put gear on your hirelings and I'll suggest you check this out as to what's preferred, just go over to the article called Bowazon and look at the bottom of it. Don't panic about having any of those, though, you can find substitutes and if you play well, any hireling will help you out a lot even if the items aren't great. It's easier, though, if they are. :)

For now, I'd just suggest to just keep on going and shout if you're getting frustrated with your progress. Probably the best route is to use Terror to break up groups, Decrepify/Amp damage to help you guys kill faster and Corpse Explosion to weaken/kill groups of enemies. Life Tap can also have use because you can steal life from non leechable enemies like Skeletons.

My turn for a show. Feel free to ask about how I made it past Act III Nightmare with my gear. :)