my favorite class in D2 was the necromancer, and since i cant have an army of skeletons i tried to pick the most summon skills, ZDogs, Gargantuan, and some wall of Zombies runed with Creepers, and I picked a couple high damage skills,like firebats, and Zombie bears. My main attack was also spiders so I could have a bunch more adds, and they also block enemies movements and slow them with the medusa rune.
I also chose my passives to work well with poison runed Zdogs, and gargantuan, to get bad medicine spread everywhere,and Zbears can spread the bad Medicine too, and Jungle Fort for extra def, and Zombie Handler for extra summon health and dog.
Runed Spiders for mana regen, cause i forgot about that haha, and just thought wall zombies runed creepers are cool, but too weak, so i switched it to Fetish Army with Posion rune to help spread dot when they are up and it looks sick in the vid preview and Its more summons!!! And for defense mainly my pets and the 40% dmg reduction which will be up most of the time, can switch out Fetish army for and other def skill if i need one.
Looks like a solid build. My only real concern would be Mana consumption. You are going to be burning through your MP very fast, with no skills or anything to get some back. You would definetly need to stack up on MP regen gear for this to be effective.
Not sure if you think it is really important but you have Bad Medicine as a passive but only your zombie bears deal poison damage. Don't think this is really a problem, the bears are just a little on the expensive side to spam. Might recommend Fetish Sycophants to add to your minions or Fierce Loyalty passives in place of Bad Medicine. Probably the later since thorns on and regeneration for all the minions could actually substantially raise your overall dps. The thorns affix also seems to be possible on most equipment, just no gloves and bracers according to beta string data.