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HQ
Librarian Mlvl2, and Foe Smiter(120)
Troops
1. Tactical Squad 9 marines, 1 veteran serge, plasma cannon, plasma gun, and melta bombs(185)
2. Tactical Squad 9 marines, 1 veteran serge, Missile launcher, plasma gun, and melta bombs(185)
Elites
Venerable Dread with Twin linked Lascannon(150)
Fast Attack
Raven wing Attack Squadron with plasma gun,melta bombs, and veteran serge(110)

Basically my idea was to combat squad the Tacticals and have the librarian run with one of the combat squads with a plasma gun
I am facing necrons and i know they are not bringing any fliers. Any reccomendations?

I like it, and can't think of any thing to add. So my advice is to keep it like it is. Hunt on.

Any reccomendations on what i should run the libby with?

I like the foe-smiter but maybe you'd like to move those points to someone else.

Any reccomendations?

Maybe lose the Ravenwing and add some veterans with meltas or other special stuff they like.