I was thinking about garrisons. In previous installments, they were almost empty and not really needed. It would be interesting to add the ability to upgrade them. For example, you enter a garrison and improve it by spending a certain amount, and depending on the garrison level (the number of levels would depend on the number of upgrades), a certain army would appear each week (it wouldn’t be possible to take it out of the garrison), and the defense would be strengthened.
What do you think about this?