Drasius wrote:
Obvious answer is some tomb blades since you've got everything else for a decurion/reclamation legion and a canoptek harvest.

From there, you've already got the sword/board lychstar base, so Orikan and the requisite lord and overlord for a royal court is definately an option if you want to be hated. Zandrek and Obyron can be exchanged for the generic lord and overlord and certainly make for a potent deathstar.

Some destroyers and a D-Lord for the option of a destroyer cult would be the next step after that I'd suggest if you want to expand further, though an equally valid though less often seen option is praetorians and a triarch stalker for a judicator battalion.

Or you could just keep getting more tomb blades and wraiths.

A unit of deathmarks wouldn't go astray either.

Basically, once you've got the basics for a decurion, there's very little that's a bad choice in the necron dex.

 Drasius wrote:
Lychguard get teleport from veil, they don't belong in reserves since I doubt there's an army out there who can alpha them off the table when Orikan is attached.

A monolith would do your opponent favours. They can have their moments in casual games, but it heavily relies on you bringing an AV13 wall of other targets that's much harder to do now that AB's aren't 90 ppm anymore. Or that your opponent brought insufficient anti tank to deal with an AV14 box with a battlecannon, which is not a terribly common occurance.