新的派系和戰場加入了Root的世界！
地下世界擴展包包括：
地下大公國：一個帝國派系，將侯爵夫人的靈活性與不斷升級的鷹巢王朝相結合。
Corvid 陰謀：一個秘密派系，將陰謀直接落入他們的對手手中。
兩張新地圖：在山地地圖上挖掘隧道或在湖泊地圖上爭奪控制渡口。
New factions and battlefields join the world of Root!
The Underworld Expansion includes:
- The Great Underground Duchy: an imperial faction that mixes the flexibility of the Marquise with the escalating Eyrie Dynasties.
- The Corvid Conspiracy: a secretive faction that hatches plots directly into the hands of their opponents.
- Two new maps: dig tunnels on the mountain map or fight to control the ferry on the lake map.
