So I have a Barb (ww dust,) Sorceress (lightning spear), druid ( landslide lightning )very OP. And barrage rogue…
It’s Necromancer worth doing? I mean 1 more spark one hurt. Any engaging t7 or pit builds? Sorry I’m on the spectrum is this doesn’t make sense
Minionless Blood Surge slaps in IH, can easly handle T7.
Did a Blood Lance build this season, able to clear T8 hordes with decent aether amounts and do all tormented bosses including Lilith, can do pit 101 (probably much higher but have not tried to push yet)
Highly recommend the build, its very fun and strong.
Bone Spirit – really a pain in the rear to gear. But once you bring it online it is soooooooooo satisfying.
I mean i am sitting on 82k life that gets basically doubled by bonestorm and the bone spirit thingy one shots tormented bosses.
Yes i am a little bit in love.
I played pre-seasons and seasons 1-4 Necro … it’s hard-to-find compelling reason to play it atm … Like previous speaker said - before you have your Bone Spirit killing machine - you need gear … a lot of it … much like last season for Tyriel-Bleed Bash Barb 
Leveling Necro to 100 still a breeze … if you have other classes to farm myths … why not?
My Blood Lance Necro is doing around 300 millions overpower damage with average of 20 millions critical.
Blood lance can clear IH8, decimate tormented boss (I can facetank them up to 5-6 debuff), clear pit 130 (so far, got tired of pit) can be nearly immortal when build right.
Blood Surge is a blast and very easy to play. It can run T8 Hordes. Yeah the bosses take a bit longer, but they can’t kill you. It farms T7 Hordes easily.
It sucks at Pit though. 120 can be a pain and I don’t know how much higher it could go because the single target isn’t great. But with Hordes giving you all the Pit mats you need, there isn’t much reason to run Pit this season so it’s not a huge deal.
Farming Helltides is fun. With Cruor’s Embrace, a Ring of Starless Skies and a ring with Starlight Aspect, you can just sit on the Maiden summong circle holding down Blood Surge and killing everything, including the Maiden when she pops. Drink a coffee with one hand and farm your mats with the other!
I have a poorly geared Bone Spirit build that slaps for 7-10B - It’s legitimately stronger than all the builds you’ve listed.
Run any minions build until you get the gear, convert to it asap.
Google Perra gaming, follow the build he just posted on YouTube that was handcrafted by two of the best Diablo players in the world.
Bone Spirit with the right gear is some of the most fun you will ever have.
I must be the only person who has no idea how Blood Lance works. So it’s Bone Spear, but with a chaining gimmick? But most mobs die in one hit, from the little I’ve played…
Blood Artisan is all I am going to say. Build around it with blood lance and blood wave. I have guides separately on the bone and blood side of things, too. 
But, you know… It’s necromancer. Not much there to do. Very limited options. Basically, you can’t do it wrong. 