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Mohreb

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Jan 15, 2010
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hy all, i searched thease forums but haven't found info (not in the manual or wherewer on the net) so i would like to ask:
Does global effects from building in strongholds addition?
like having 2 research cost -20% in 2 different strongholds makes : 40 % or makes 36% if or will rest 20% ?
also for the hera upgarding effects such as +10 manna / +1 skill / +2 alignement to all heroes different buildings .. does two of them gives 20 / 2 / 4 ?
so but it on global question wich kind of buildings addition and how does they?