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So after a few games against a DE player, I was riding high as I simply smacked him down to the ground. But then I was challenged to a fight against a space wolfs player. At first I'm thinkin no prboblem, but then I found that he was drop podding his whole army. Surfice it to say, when one of his squads landed almost ontop of mine, I let loose with all the forces the C'tan had to offer. I wiped out all but two of his models, both powerfist carrying. In two turns, those two marines were still alive and had wiped 6 warriors of a ten warrior squad out, even my lord didn't seem to help. At any rate, what can the necrons do to counter power weapon spaming by SMurfs?
Wraiths are a great antidote to the Powerfist. It doesn't matter how hard the Space Dogs are swinging, they'll still just catch air.
A Resurrection Orb nearby will allow a Necron to rebuild himself after suffering even the most grievous damage.
Either weapon the Lord can carry counts as a Power Weapon. The Warscythe is especially nasty.
If you need to get out of combat quickly, use the Veil of Darkness to teleport away, and then blast them when you re-materialize.
And if all else fails, just have the Nightbringer take care of them.
WHFB: Dwarfs || WH40k: Imperial Fists, Necrons || WM/H: Trollbloods || BFG: Necrons