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Do the effects of duplicate buildings stack? For example, if a player has two Temples, do they gain two extra faction levels on a zero or one level die?
The permanent effects of repeat Buildings stack. So in the case of two Temples, you would get the benefit of both.
It is important to note however, that if you choose an action from a building, you can only execute one action per turn so in the case where you have two of the same building and both have "Actions", you can only use the "Action" from one of the building cards.