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The Demon Sword is the sword that Joshua formerly owned. It is the family sword, and is the prize at the end of Joshua's Dungeon, which Finn and Jake were sent to explore in the episode "Dad's Dungeon." It is made entirely out of Demon blood, as explained by Joshua in the hologram video that he made for Finn and Jake in the future. The sword has a Celtic cross on the hilt. It was found in the last chamber of the dungeon, where Finn uses it to defeat the Evil Monster. It was locked up with chains and stuck in a formation of crystals when Finn found it; the key for it was around a monster's wrist. Instead of defeating the monster to get the sword, Finn ripped it from the crystals, breaking the chains, and subsequently used the sword to defeat the monster.

This sword replaced the Root Sword that Finn found in "Mystery Train." Finn used this sword for the first time (not counting "Dad's Dungeon") in the episode, "Return to the Nightosphere." It seems that the design for the sword was slightly changed for that episode, the tip of the handle is white instead of red.

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