Improvements
Your castle gives you many bonuses, all of which are available at the cost of resources. By spending resources on each part of your Castle, you get the appropriate bonus. Bonuses are instantaneous after you have invested your resources, and the bonuses are less effective as your Dominion grows in size. Thus, a larger amount of resources is needed to keep your bonuses high as your Dominion gets larger. "Invested" is a point system. You can invest ore, platinum, lumber and gems. Each research point is worth 20 points, each gem is worth 3 points, each block of lumber .5 points, each ore .5 points, and each piece of platinum only .25 points. The difference, should you be wondering, is this: Platinum has multiple uses, notably for building, rezoning and military costs. Ore, on the other hand, is only used for certain military units. The only use for gems, however, is to invest in your castle. This makes Diamond mines more useful than otherwise, and also allows you to put to good use your other excess resources.
Your Castle
Part
Rating
Invested
Invest
Science: +0.09% income  200 
Keep: +0.09% max population  200 
Towers: +0.09% wizard power  200 
Forges: +0.09% offensive power  200 
Walls: +0.09% defensive power  200 
Irrigation: +0.09% food production  200 
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