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Flame Knuckle is encountered during the Lost Legion's hostile takeover of the Helios space station, attempting to stop Jack and his Vault Hunters from escaping alive. At first, he is fought in a Dahl powersuit, and when his suit is destroyed he continues the battle on foot.
- Main article: Lost Legion Invasion
- Flame Knuckle has an increased chance to drop the Nukem.
- Killing Flame Knuckle contributes towards the No Suit for You! challenge in the Enemies challenge list.
- Flame Knuckle has a chance to spawn in The Holodome during one of the Digistructed Madness rounds.