Improvements
From ENDLESS Legend 2 Official Wiki
Improvements are a vital class of constructible building in Cities which can only be constructed once per City. The most powerful ones can often only be built once per Empire. They have large costs and confer extremely strong benefits. Most Improvements are unlocked via Technologies, but all standard Populations also unlock a special unique Improvement synergizing with their Faction's gameplay style upon reaching the first population collection threshold (5, or 3 if playing Aspects). Some Improvements are instead unlocked via Quest or Deed rewards.
Improvements are the only current use of the Glassteel, Hyperium, and Thalitine Strategic Resources.


