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Does the invisibility psychic power stack with the cover save granted by the Venomthropes spore cloud?

It does work with spore cloud, however as there is only one unit in the Tyranids codex that has a mastery rating of 2, that result on the table must be rerolled unless you get it with the Swarmlord. Additionally since you cannot ally with anyone in normal games, you're not going to see that particular combo being used too often.