Looks like a fun and fluffy list.
Just a few thoughts:
• I see you have a Lord and a Cryptek in the same unit. The general consensus is that you can only have 1 member of a Royal Court split into another unit. If you have a second Royal Court, then you're fine.
• I find Lords far too expensive for what they do. They only have 1 wound and are sub-par in combat. Yes, Mind Shackle Scarabs and the Res Orb are great, but why not just have an Overlord equipped with those instead?
• I foresee your list having a hard time against melee oriented armies. If you plop your warriors in front of one, you are heavily relying on those mass
str 4 shots to take out the entire threat radius. Once a dedicated assault unit makes into combat with them... it's a downhill battle from there. If you lose combat by 4 and take a moral test.... well... chances are you will be falling back and all the points you spent on Res Orbs and Lords will be a waste.
• Your Deathmarks would benefit greatly with a Despair Cryptek. An
ap 1 flame template that wounds on 2's is awesome.

(against units that are marked for death)
EDIT: Also, with the new
FAQ that just came out, you can no longer Deep Strike your Night Scythes (if that was your intent). No big deal, just fly them on.