Kickstarter https://www.kickstarter.com/projects/2074786394/root-the-underworld-expansion
English - Root was funded on the Crowdfunding Kickstarter (See the campaign) platform on the Apr 3, 2019, the campaign lasted 20 days. 20,886 people helped funded the game, whose the amount requested was $25,000.00. Thanks to these 20,886 people the game could be funded up to $1,726,461.00, ~6,905.84%.
Boardgamegeek https://boardgamegeek.com/boardgameexpansion/272637/root-underworld-expansion
English - 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...
Ludovox https://ludovox.fr/jeu-de-societe/root-the-underworld-expansion/
French - Cette extension de Root apporte deux nouveaux peuples.