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The Lightning Sword appears in the episode "Dungeon Train". Finn obtains the sword after pushing its previous owner, Oinko, out of the first train car. He then uses it to blast the Crystal Ants in the second car of the Dungeon Train, and later, to cut through the inhabitants of the following cars.
Appearance[]
The Lightning Sword has a blue, luminous blade shaped like a jagged lightning bolt, with a guard and pommel shaped like (or made of) clouds, and a hilt seemingly wrapped in brown leather.
Abilities[]
The Lightning Sword can fire blasts of lightning, and is very sharp.
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