Wait, what? How is that possible? Meaning, if I've built a Dimension Door, for example, and I know the opponent might arrive soon, I can't rebuild the tower so he doesn't get this Dimension Door for free? That is definitely bad.
And another situation: after building and researching an imp, I can no longer rebuild it into a Dimension Door? And vice versa, etc. etc.? Well, that's just not right(
It seems like the old rebuilding system was times more profitable, or am I misunderstanding something

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