This build is a well rounded [Nekros] build that is very flexible and can be used in a variety of ways.

One of the problems that I've found with some Nekros builds (especially those that specialize) out there is their lack of sustainability and/or their intense attention to upkeep in order to stay alive. This build is very sustainable through the mission and doesn't require much attention in order to survive.

[Creeping Terrify] here provides great CC and a way to give yourself additional survival options without needing [Shield Of Shadows] here. Between Terrify and Shadows of the Dead, you really shouldn't be taking any damage ever as enemies will either be running away from you (slowly) or focusing their attention at your shadows. You'll get about a 74% slow on Terrify with the augment, so you have a mini-Molecular Prime at your disposal. The nice thing about Terrify is that enemy's not only are slowed, but they stop their current actions and turn away from you. So it is a complete CC and not just a slow effect.

Like I said, this build is about sustainability. With a decent amount of efficiency and duration, you'll easily be able to sustain a generous amount of energy to always keep some shadows alive and spam terrify. The return that you'll get with Desecrate will be very large due to your ability efficiency and [Equilibrium]. Because of this, there is no need to run [Despoil], which saves a mod slot here.

The decay on your shadows will only be 2% with 143% duration, allowing you to not have to worry about them dying so quickly.

After trying many [Nekros] builds, this is the one that I've found works best for me. Going long into endurance missions, I've found it has the most wiggle room for error and if you come across something like a hidden energy leech, you're not screwed trying to [Recover]. Also, because you're not 100% built around shadows, if your shadows get dropped, then you have a back option with Terrify to give yourself some room to get some back up. WIth this build, I find myself using [Nekros] much more and in a more variety of missions due to its flexibility.