Do these three stack?

[BIG ROB OF DEATH]

I have a question regarding protecting my shadowsword (unmodified armor save of 3+): can you stack the strategem 'Take Cover!' with the super-heavy ace 'Hull-Down deployment' with the psychic power 'Psychic Barrier' to get +3 to its armor save roll? If not, what about the strategem 'Prepared Positions"? Does that stack in this somehow?

[librisrouge]

No, because the errata made Take Cover! only apply to infantry. Similarly, Prepared Positions doesn't apply to TITANIC models.

 

However, Psychic Barrier and Hull-Down Deployment should be able to stack.

[Phubar]

For further explanation the prepared position stratagem doesnt add a save, just make the units to be considered in cover (so units already in cover doent gain any further benefit)