While at first glance Necromancer and Wizard from Diablo 3 mod do not have any form of synergy, both of them can be good if you choose to focus on the cold damage. Then Diablo 3 v.3.3 arrived, bringing the rebalanced Grace of Inarius set.
Build
Attribute points: 87 into Physique, 20 into Spirit.
Items from the mod: Grace of Inarius (level 94 version), Mythical Wrath of the Bone King, Mythical Leper’s Disdain, Mythical Fazula’s Improbable Chain.
Relic: Kanai’s Cube: Swami.
Augments: 4 Venomguard powder, 3 Dreeg’s Fiendblood, Potent Creed’s Cunning, 3 Ateph’s Glare, Rune of Amarok’s Breath.
In order to get 80% Freeze resistance, craft both Elemental Harmony rings (Mythical Ruby and Mythical Sapphire) at the Malmouth Resistance base in the Steel cap District. The medal (Mark of the Shadow Queen) can be crafted with any bonus.
Devotions
First tier: Sailor’s Guide, Wolverine, Empty Throne, Quill, Spider, Ghoul.
Second tier: Kraken, Rhowan’s Crown, Murmur (put only four devotion points to get the proc), Chariot of the Dead).
Third tier: Leviathan (max it out).
Tactics
That build is straightforward - you may simply rush trash mobs or Hero monsters and beat them down with your mace. Against bosses and Nemesises use Decrepify to debuff them and activate Archon. Don’t be arrogant and don’t fight with multiple Nemesises at the same time. And be careful with Diablo 3 bosses in the Shattered Realm.
Magic Weapon has 17% damage reduction at the 17th level and Decrepify reduces enemy damage by 32% at the 19th level 
. Bone Armor and Energy Armour give you flat damage absorption. Also you have very high physical resistance (~50%).
In the Shattered Realm
It wasn’t very hard. Karl the White Wizard is a good farmer of Shattered Realm. I’m pretty sure that I can go even deeper.