The new vassal system lets you specialise subject empires, which then develop handy traits as they level up within the greater empire they're a part of, making that 30% research tax an easy pill ...

Stellaris - Overlord expansion release date trailer. Watch on YouTube Overlord also brings three new enclaves players can take advantage of, either through mutual agreement or by force.

Stellaris, for my money, trends toward good value, but the waters are slightly muddied by the huge free updates that release alongside the paid components. In short, Overlord is excellent, but ...