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I've heard multiple people say that necrons struggle against psychic armies.

necron players, what powers do you hate to play against?

non necron players, what powers do you find works best against necrons?

I am building a Grey knight/SM army with tiggy and marines supporting my grey knights. I know that there are a couple necron players in the local area that will be up an upcoming tournament and I am trying to plan for them. Since I should be able to throw my psychic weight around, besides invisibility, what powers do ya'll fish for against necrons.

With Grey Knights+SM, I really do fish for Invisibility. The big reason is it gives you something to match their durability, and enables my dreadknights to tie up their wraiths. I'll also fish for Cleansing Flame on at least one GK librarian due to the prevalence of 4+ saves the necrons have. Honestly the most useful power against them other than Invisibility is Force.

Enfeeble, force, invisibility, prescience, forewarning, perfect timing.

The stuff you usually want are good against them.

Enfeeble is the best offensive power against Necron. Cast it on Wraiths and fire the Battle Cannon or massed Krak Missiles or Lascannon so you could ID a few unlucky ones, since once they failed 3++, only 5+ RP could save them or 6+ if not in formation, while those destroyers will fall even quicker in this manner. Cast it on warriors then flame them with GK Incenirator, and you could watch those robots melt. Same goes for anything S6 / S7 and AP4 / AP3, but you need that power go off first.