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Eldar use to be Imperial allies back in the day, and should be battle brothers with the Inquisition per background fluff dating back to RT days. Ultramarines have and unhealth partnership with Tau per their fluff. On the flipside, why oh why would Necrons ally with anyone?!? I can see forces of Chaos allying with pretty much everyone except for 'Nids, who might require a "corruption" suppliment to pull that off, or 'Crons (or obvious reasons).

I find the matrix to make sense for the most part, and hope they adjust it in the future to be more in line with their own background fluff.

SJ

The Tau partnership simply doesn't make sense, the codex itself (well, at least the 5th Ed one, haven't really read the fluff too much in the new one yet as I just received it) contradicts it - there's the whole bit about the UM + various other chapters fighting against a Tau offensive and whatnot, and it's a "current" event. Allies of convenience I could see in a stretch, but Battle Brothers? Ridiculous.

 tvih wrote:
The Tau partnership simply doesn't make sense, the codex itself (well, at least the 5th Ed one, haven't really read the fluff too much in the new one yet as I just received it) contradicts it - there's the whole bit about the UM + various other chapters fighting against a Tau offensive and whatnot, and it's a "current" event. Allies of convenience I could see in a stretch, but Battle Brothers? Ridiculous.

I was always to understand that the allies chart represents not just the closeness in ideology, but in tactics as well. While philosophically they are quite different, the Tau and the Space Marines share a similarity of combat doctrine, based on rapid, surgical strikes, that would enable them to cooperate on a military basis much better than some other pairings, even other Imperial pairings. Seems reasonable to me.

I don't see how having a similar military approach has much bearing on your willingness to ally with an enemy. In fact you could as easily argue the opposite, in that you'd be more willing to ally with a foe with completely different capabilities than your own because their style of combat, though alien, has proven effective.

 Jimsolo wrote:

 tvih wrote:
The Tau partnership simply doesn't make sense, the codex itself (well, at least the 5th Ed one, haven't really read the fluff too much in the new one yet as I just received it) contradicts it - there's the whole bit about the UM + various other chapters fighting against a Tau offensive and whatnot, and it's a "current" event. Allies of convenience I could see in a stretch, but Battle Brothers? Ridiculous.

I was always to understand that the allies chart represents not just the closeness in ideology, but in tactics as well. While philosophically they are quite different, the Tau and the Space Marines share a similarity of combat doctrine, based on rapid, surgical strikes, that would enable them to cooperate on a military basis much better than some other pairings, even other Imperial pairings. Seems reasonable to me.

Grey Knights and Necrons share neither tactics nor ideology. Let's be honest: They threw a bunch of names in a hat and drew at random.

 NuggzTheNinja wrote:
Grey Knights and Necrons share neither tactics nor ideology.

Which is why they're allies of convenience, not battle brothers. GK know that Necrons can't be turned to Chaos, so they're potentially useful allies if there's a greater enemy to deal with.

If they don't know necrons .Then how can they think that they can't be turned to chaos , when even super human primarchs did ?

Makumba wrote:
If they don't know necrons .Then how can they think that they can't be turned to chaos , when even super human primarchs did ?

Um... what?

Necrons can't be turned to Chaos. Doesn't matter if the Primarchs could.

 ChakLong wrote:

Makumba wrote:
If they don't know necrons .Then how can they think that they can't be turned to chaos , when even super human primarchs did ?

Um... what?

Necrons can't be turned to Chaos. Doesn't matter if the Primarchs could.

Keywords: they, think, don't know Necrons.
Your universe knowledge might be a little different than GKs. Do they _really_ know that Necrons are immune to chaos?

Necrons are immune to chaos as they do not register in the warp.

Dakka discussion as to why Necrons cant fall to chaos

http://www.dakkadakka.com/dakkaforum/posts/list/486596.page

*but i guess you could forcibly insert a deamon into a necron body.

Hazal your not getting.what he is saying, we as godly overlords of the 40k universe know more that any living in universe character, whilst we know that necrons can't fall to chaos (but can be corrupted by its warping influence) the grey knights do not know this fact at all, they simply believe that the necrons can't fall, but cannot be certain of it.