Overview
Necrons are a really hard race, this guide will tell you how to play it.
Early game
Exploit the fact that you have free units constantly. Never let the enemy forget you have the capability of killing their expensive 200 req unit with a free one of your own.
Tier 2
Spam wraiths, immortals and flayed ones. Vehicles are bad, don’t bother with that. Swarm the enemy vehicles with flayed ones and send a constant stream of wraiths to irritate your opponent.
Rest of Game
Continue spamming free units until you can turtle forever. Then build like 5 monoliths, and upgrade them all. Upgrade one into super duper monolith, and send that to go harass the enemy. If for some reason the enemy is able to kill your monolith, retaliate by sending the 20 squads of warriors you’ve been saving up at them. That’ll show those anti-vehicle troops who’s boss. While your free meat shield is getting shot at, restore another monolith, and rinse and repeat. With this strategy, the enemy should be defeated in about 2 hours.
Other really cool stuff you can do
Necron lord can bring his army back from the dead! Exploit this ability constantly, it is especially useful after a free necron warrior spam. This ability can even break the squad cap, if several thousand free warriors were all killed in the same place. Teleport in, resurrect, teleport out. Doing this is a fun and productive activity for the necron lord.
Necron lord can also make units around him invisible. That’s stupid and boring, don’t do that.
If you have a summoning core, you can cause your entire army of free troops to teleport to one of your buildings! This includes the moving monolith, meaning wherever your army is, it will never have to miss out on the fun.