He is the EdgeLord, you are not the EdgeLord, he is the EdgeLord!
I tried to put Umbral mods on [Nekros], but those just not fit here... there's absolutely NO POINT. Too much disadvantage according to benefits.
This build is absolutely "purfect"!
And here it is... my [Nekros Prime] with his fancy [Shield Of Shadows], cutting himself for your pleasure, yet not dying because he loves to drink blood... lots of Bloody Orbs.
To make him even more "tankee" I gave him both augments, [Adaptation] (R9 just because of capacity issue), and his standard equipment like [Equilibrium] and [Health Conversion]. Those mods synergies with them self so great, that even very low efficiency is not a bit of problem.
EdgeLord need exactly 215% Strength to achieve 90% damage "reduction" from his minions. With 214% you got 89.88% so let just say we achieved our goal.
To even more synergy I gave him his best pal... Sentinel. They love each other. Why? They complement each other. Just look at his pal's build, and you'll understand.
I suggest you use Arcane Grace and Arcane Guardian, first one heals, second one add armor.
Primary - Primary Meat Slasher
Secondary - Secondary Meat Slasher
Melee - Melee Meat Slasher
Sentinel - Primed Best Friend Forever
Sentinel Weapon - Little Helper