The Necromancer is very difficult in Act 4, while he can pummel most other bosses, he doesn't do as well against those annoying mage knights in Act 4.
My only advice is to try to level up more and put a ton of points in Bone Spear, you can kill most guys in Act 4 (including big D) it goes right through enemies, so you can hit a ton of guys in a big group, which makes it quite useful in Act 4. You can kill Diablo with it, it will take a long time, but eventually he will fall, just have a town portal open constantly, in case you die.
Dodge his attacks best you can, same with the mage knights, you will be able to finish off most monsters in Act 4 by killing them with bone spear, it damages enough of them to hurt them properly. With patch 1.11 you should have synergy from Teeth and such to have bonespear doing enough damage at level two or so.
That's all I suggest, once you reach Nightmare, it will be alot easier, just spend alot of points on your damaging skills, bonespear will keep you alive through most of the game, just upgrade it every now and then.
Oh, and summons are completely useless, look to changing the type of skills you use (I only ever use Fire Golem, and even that gets useless in Hell difficulty when most monsters are immune).
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