@toxic_wisdom:
I have considered nightmare but currently he exceeds my price range. Also he is less focus efficient than the Seether. Infact i have found the Seether to be one of my best choices-it rarley needs to be given any focus unless it charges and even then due to its rules and abilities it usually only needs 1 focus.
The Necrotech is in there to keep my Jacks going. When my enemy cripples a system or damages my jack i want to be able to keep it going and this is the most effective way. Alos those annoying charge blocking wreck markers can be removed
@BunkerBob:
I have seen what it does and as soon as i enter the next(2nd) phase of my Cryx i will get one

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It should be worth noting here that i also have the Witch Coven of Garlghast as well.