Root: The Marauder Expansion introduces two new factions to the Woodland⁠—the Lord of the Hundreds and Keepers in Iron—alongside four hirelings and a new setup draft suitable for both casual and competitive play.

Play as the:
- Lord of the Hundreds – Oppress the Woodland and burn it to the ground if need be. You suffer no dissent.
- Keepers in Iron – Lead your exiled order of devout knights into battle to recover ancient relics. For glory!

Both of these factions are suitable to Root's two-player game, bringing the total number of two-player factions up to five without the use of bots.

Root: The Marauder Expansion also introduces a new level to the conflict for the woodland: Hirelings! These small factions can be used at any player count and introduce surprising new power combinations as well as a chess-like tension to lower player count games of Root.

- Forest Patrol & Feline Physicians – Secure your realm and heal deadly injuries with Marquise elites.
- Last Dynasty & Bluebird Nobles – Crush your foes and prove your legitimacy with the last Eyrie regiment.
- Spring Uprising & Rabbit Scouts – Revolt against despots and fight for freedom with Alliance sympathizers.
- The Exile & The Bandit – Stalk the forests and steal what you need with these Vagabond mercenaries.

Finally, The Marauder Expansion also includes a new set-up draft system suitable for both casual and competitive play.