The flame cloak is, as the name suggests, a cloak made out of flames. Finn is seen wearing it in "Dungeon Train" after he somehow obtains it from a boss fight as loot. He wears it throughout the rest of the episode as he takes Jake's pack and retrieves his future crystal.
- It is unknown if it actually burns the person wearing it. It could be Finn's resistance to fire that keeps him ignoring it or it could be conditioned with a fabric or metal on the inside.