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I was considering do 2 x aegis defense lines, using the quad guns chopped down to make 4 twin linked autocannons for my dreads. Then ill surround the dreads with the aegis to make kind of 2 dread turrets.

Then that got me thinking, would dreads be a waste? Should i just get devastaters instead. Sergeant on the quad gun and a mix of heavy weapons.

What are your thoughts??

Dreadnoughts are immune to str5 and below as well as being cheaper(you need to take extra bodies with devies)

And if i go grey knights the cannons are more powerful and they get a very good psychic save.

Was thinking 2 to pound anything that comes near my side of the table. aegis gives it a gd save aswel.

Gks do all DTW on at least a 5+ and psykers are at -1ld for the test, but thats still not great.

Psycannons are also only 24" range, so its really best as an offensive mobile weapon.

^ and -4 LD when casting against a 12" bubble from the dreads. But as Grey Templar succinctly pointed out, GK can really only shoot 24" effectively. Too many other armies have 30, 36, or 48 inch ranged weapons in large enough quantities to sit back and kill no only your dreads but good chunks of everything else too if you don't get closer. If you want to camp, you're better off with vanilla marines (who are supposedly getting a new codex soon), and making those dreads venerable to free up your heavy support slots.

One thing that is becoming better with new codecies are purgators...Astral Aim is really starting to shine.

Depending on the use of forgeworld units in your area, the dreads could be used as mortis variants.

This would give them the advantage of skyfire, which devastators can only get if they missile launchers, and then must pay for the over-costed skyfire missiles.
Using the DA codex for numbers, the cost of a 5 man devastator squad with skyfire missiles is 35 points more than a mortis. And even then the missiles are not twin linked like the auto cannons.

This to me is an advantage of the dreads.

For anti-armour in a game without too many flyers, devastators would probably be more efficient. Being able to take 4 lascannons in one squad really puts their firepower over that of a dreadnought.

A large part of the decision hinges on the rest of the list. If you are bringing a number of vehicles, then the dreads are a better choice, but on the other hand, if not, then take devs, as 2 AV12 walkers, even behind an ADL, will still crumple to dedicated anti-tank fire as the opponent will have no other vehicles to target.

For anti-Flier, I would say take devs with Lascannons, and give the Sgt the quad gun. Aganist fliers, you have a reasonably good chance to hit with an LC to add to the Quad's firepower (which being SF and TL is better than the TLAC dread), while being far more effective than the dread aganist vehicles on the ground. It is also easier to hide Devs from LOS than a dread, and in an emergency you can GTG with them for a 2+ cover unlike the dread. Overall, I would say a 4x LC dev squad with a Quad gun is the best setup for this kind of role, being more effective and versatile. (NB this is assuming they are costed equally to the DA devs in the new codex)

As as final note on devs, always take them with 4 of the same weapon, a mix will just mean they lose effectiveness against all types of target. Pick a role for them, and stick to it.