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So as conversations with my friends who play 40k invariably turn into hypothetical "what if" scenarios, it was postulated that if the Imperium came across a xenos species that used demaons, that it would be possible to have Deathwatch kill teams, working in the same theatre of operations as Grey Knights.

Now my take on it was that the Ordo malleus would either pull rank or work in back ground, while the Deathwatch would do the overt work without realising the Grey Knights where about.

However Inquistorial shanigans taken into account, would it be possible that they could be aware of each other to co ordinate operations? or even that the actual forces involved could be aware of each other?

What are other peoples thoughts on this? Any extra scenarios are welcome or even fluff examples.

Thanks for your time!

The GK are extremely secretive. While they might do joint-operations with the Deathwatch, any Deathwatch Marines who witnessed the GK in action would be mind-wiped after the action.

Mind wiped at min, deamons "don't,t exist"

Marines too vbaluble to be killed, so mind wiped.

Its a massive secret, some know of it (rarely) , but general population at large know nothing, if they do learn its very grim for them, deathkorp grim.