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