Canoptek Wraith
These are some scary Snake mother fuckers. Did I mention they are the Grilled Cheese Sandwich of the Necron Codex. You can take them in the creepy crawlies formation. If you take 3 Snakes, 1 spider, and 3 bugs they get access to reanimation protocols among other things. They Slither over everything, and have a 3++ save. They are basically faster Lychguard with 2 wounds. Did I mention these guys are basically Necropolis Knights or Sepulchers from the Tomb Kings (rip. may your sleep be blessed). Besides that there's not much I can say.
They used to look like a modified Necron Warrior like the Necron Destroyer and Flayed Ones but with the lower torso replaced with a snake like tail and their hands turning into razor-sharp talons. Nowadays they have been given a face lift and now count as a Necron Construct, not a troop. And as you may already know they are much more spooky now.