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I did my season journey on my Necro, just had to team up with a full party for the T10 2 minute rift with Avarice and Divinity as my other 2 conquests. And that was with only 2 ancients, neither of which were augmented.
Once you hit 70 the xp gem cuts to only a 10th of what it was so instead of say 41% for a flawless royal it drops to 4.1%.... Better off usually running a diamond in helm for cooldown reduction.
Build that I am finding interesting to run on necro is Bones of Rathma with Jairoan Arms sets, Circle of Nailuj ring and Reaper Wraps bracer using Command Skeletons with Kill command, Skeletal mage with Contamination, Devour with devouring Aura and Army of the Dead with Blighted Grasp skills...