In the second mission of the tutorial campaign, one of the secondary missions is to build a unique building in your starting town. I chose the Angel Watch building, which has the following right-click description:
Fills the Guardian Angel faction ability gauge to rank 1 at the start of each combat.
After building the Angel Watch, I fought many battles before the end of the mission, and I only saw the faction ability gauge start at rank 1 twice.
Is there some other requirement that must be met before the building activates? If so, what is it?