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Hey, I was wondering if you guys have any tactics for fighting Space marines as Necrons.

Well, I'd take a balanced force with 1 or 2 DLords (mss, weave), 2x 6 or 3x 5 Wraiths, 3 to 4 Warrior or Immortal units in Night Scythes, and 3 Annihilation Barges.

Depends.
Do you expect to face a few squads of Terminators? Yeah, go with Wraiths + D-Lords (or alternatively, a couple of Death & Despair squads).
If you think you'll only have to deal with power armor, load up on Destroyers to deny their 3+ saves (alternatively, a Shooty RCDI).

Honestly, Necrons match up well against marines in most all aspects. We're tougher than them, and our shooting is better, most any list will be able to hold its own assuming the generalship and dice are good.

Telsa Weapons are gold, since volume of fire will negate the advantage of their 3+ armor.
Destroyers are just too expensive for what they do in my opinion. Destroyer Lords are borderline OP good when paired with wraiths

Ghost arks and warrior blobs work, using the gauss vs vehicles
Flyer Spam Works
Wraith Spam works
Combined arms works
Scarab farm works, depending on the list

Generally, marines are a shooty army, with a few assault elements, so make sure you have something to counter/tie up their 1-2 assault units, and then just outshoot them.

Otherwise, you should watch for drop pods, and bubble wrap your vehicles if they are bringing pods to the table.

Haven't played bike spam yet, but they just take concentrated fire, and clever placement in regards to deployment to beat in my opinion.

Iguy91 has it wrapped up there. I would personally go for warrior blobs backed up by anni barges and 2 or 3 scythes (at 2k), with a royal court with veiltek and 2 or 3 storm teks to deepstrike around and wreck any raiders or vindis that need to go down. Small 3 base scarab units as speed bumps that arent worth your opponent shooting. All this and you are golden. Plenty of AT, plenty of AA, weight of fire will make those meq saves seem trivial and you don't have to worry about MCs.

Wraith wing will be more effective... but I don't own any of those :-(.

Poly Ranger wrote:
Small 3 base scarab units as speed bumps that arent worth your opponent shooting.

Careful how you deploy them. You don't want to give your opponent free First Blood.

If the Space Marines you typically see do not deploy via Deep Strike, then Destroyers can be very effective. Having lost, with Space Marines, to Necron forces more times than I wish to admit, I can honestly say that the Destroyers caused it more than anything else.

If you typically see lots of metal boxes coming your way, Scarabs are great. Hell, Scarabs are just great no matter what. Against an opponent who deploys foolishly, Scarabs backed by one or more Canoptek Spyders can EASILY get a first turn assault.