The Root Monster is a plant that the Fruiter once summoned to fight First Squad. It is unknown if there are others like it.
The root monster appears to normally live underground. The Fruiter summoned it by striking the ground with his staff. It has a long serpentine body, which opens at the end into something of a mouth. It attacks by biting at and trying to swallow foes. First Squad defeated it by making it swallow huge rocks, which hurt it and left it unable to move.