Overlord Stronghold

 is a building of the Overlords.

Background
It costs 8000 Resources to build. Any unit with Builder skill level one can build a Stronghold. This is typically the first structure built, as a base of operations where units can return and store resources. A Stronghold can hold 20,000 Resources, 50 Butanium, and 50 Supplies. All valid units may receive extended training here. This structure is required in order to build an Academy, a Garage, and a Warehouse. The Stronghold can be upgraded to a Citadel.