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Magma Rivers is a unique lil' darksider mini-boss encountered in Borderlands: The Pre-Sequel. He is found on the bottom floor "The Grabba" building (which houses a Catch-A-Ride and Fast Travel stations) in the north half of Triton Flats.
Magma Rivers is a lil' darksider with increased health and damage. He will also drop better loot than most Darksiders tend to, though doesn't have any unique loot associated with him.
During the mission A New Direction, killing Magma Rivers will cause him to drop a prism, which is a required objective to complete that mission. Afterwards, he will continue to spawn in the same area.
- Within the game files, Magma Rivers is classified as Badass lil' darksider. However, no other Badass lil' darksiders ever spawn in the game.