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Sooooo. Im curious if i can field an IG army, and use stuff from, lets say Elysian regiments, like the drop-sentinel or the Tauros assault veichle.
Considering they are technically not IG, how would they pair together with regular IG? i would assume battle-brothers, and only allowed if opponent agrees, since they are a ForgeWorld "chapter".

How would you play it? Is there any official words to the matter?
(and while we are at it, which Imperial Armor contains the Elysian army list? )

You'd need your opponent's permission to field Drop-troops and DKOK anyway. You'd also need your opponent's permission to ally them.

So, ask your opponent beforehand, but I wouldn't assume anything.

Per the faq posted by Forgeworld, all the IG variants use the IG ally matrix, and treat IG as battle brothers.

There are two Elysian army lists. One is in IA8, and the other is in IA3 (I think, fairly sure it is 3)

The only exception to the above, is the renegade and heretics.