The armoured Millipede is a Canoptek Tomb Stalker a resin kit from ForgeWorld part of Games Workshop each leg is two pieces making 32 parts for the legs!
Long story short the Necron were once flesh and blood but lived very short life spans due to their sun / radiation. They made a deal with their gods who tricked them by putting them in living metal bodies, they ruled the galaxy then went to sleep for millennia. Now they are starting to awake to find the galaxy over run with young races so are going to war to claim what they believe to be theirs.
So good / bad is subjective.
The army in the game is loosely based on ancient Egypt, but in the far future.
The Necrons feature in the cinematic that was released a couple of years ago with the launch of the latest edition of the game. The rest of the characters in the video are all human, Imperial guard - the standard human solider, Sisters of battle - warrior nuns and Space Marines the super humans with 13 extra organs 3rd lung, 2nd heart etc and power armour.
