Might is the defining characteristic of your development. It comprises all of the points you get for upgrading your hero and captains, levelling up your buildings or technologies, and claiming achievement rewards.

There is a specific detail though when you upgrade a building or research technologies: the amount of might points you get is the difference between the next and the current level of that building or technology.
For instance, consider upgrading the Capitol to level 2:

  • At level 1, the Capitol grants you 2 points of might.

  • At level 2, the Capitol grants you 4 points of might.

  • Once upgraded, you can see that your might has only increased by the difference between level 2 and level 1 might points, which is 2 and not 4. The same logic applies to technologies.

In other words, the might you get is cumulative: the numbers you see at the last level of a building or a technology are the final numbers that will be added to your account once you bring it to that level.