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My question is : what exactly damages a realm ? Drawing ?
Yes, everything that involves spending color damages a realm. Depending on what you do it damages it differently, and feeding a sister is the most damaging, followed by planting trees iirc.
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Does harvesting (taking color from a tree, not planting it) also damage the realm ?
Nope, but a damaged realm will reap less color.
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Does that means planting trees of these colors will give more in each harvest, or does that means that damages dealt to predators will be greater ?
It means it damages the realm more... don't know if it does anything else(I think it does, but it also involves spoilers)
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