Strategic Coordination Center Stellaris
Strategic Coordination Center Stellaris. Only new ones get them. You only need 45,000 alloys. Stellaris Dev Diary 132 Ecumenopolis and Megastructures from steamcommunity.com If you know the trick. The initial site must be built by a construction ship, and it costs 2,500 unity and 5,000 alloys. You only need 45,000 alloys.