Finn's swords

Finn's swords refer to the ten types of swords (and a dagger) that Finn has used throughout his adventures in the Land of Ooo.

Finn's Golden Sword of Battle
The Gold Sword was Finn's weapon of choice throughout most of seasons one and two. The blade was dented, chipped, and dirty, likely due to a combination of overuse, poor maintenance, and the low-strength material properties of gold. Its hilt was black with some worn leather grip-straps and a red gemstone in the pommel (possibly a ruby). In "Business Time," the Businessmen polished and sharpened the sword, making this episode the only one in which the Gold Sword appeared to be in excellent condition.



In "The Real You," the Gold Sword passed through the Bubble Creator and became four-dimensional. Finn used the 4-D Gold Sword to attack the black hole he had created, Finn's Gold Sword was sent into the Candy Forest by the explosion. It can be seen in Fionna and cake when Finn and Jake are frozen. Finn was without a sword until "Mystery Train."

This design is the basis for the 24-inch toy version of Finn's sword, which is labeled as "Finn's Golden Sword of Battle."

Steam user M-NINJA made the sword a custom item for the Scout in the video game Team Fortress 2.

Katana
Finn was shown to possess two gold-plated katanas in the episode "Slow Love." These katana were never seen in another episode. It was used by Finn when he taught Snorlock to do sword-tricks.

Root Sword
In "Mystery Train," Finn obtains the Root Sword, which becomes his primary weapon. (The name "Root Sword" is non-canonical.) He wields this sword while aboard the Mystery Train. He next uses it against the Giant in the beginning of "Belly of the Beast." It is seen briefly in "Mortal Recoil," when Finn throws it at Ice King and in "Conquest of Cuteness" at the start of season three. Finn briefly used this sword in "Jake vs. Me-Mow." However, he keeps it in a makeshift pocket on his backpack throughout most of the episode.

Sword of the Dead
Finn wielded the Sword of the Dead to defeat Marceline's father in "It Came from the Nightosphere." Finn drew the sword from the Grass Lands before his battle and slit open the pods in Marceline's father's gullet, which he was using to imprison the souls of Ooo. Finn dropped the sword while reciting the incantation to open a portal to the Nightosphere and elected not to keep it, given that he still had the Gold Sword at the time.

Steel Sword
As of the episode "Still," Finn is shown to possess a new steel sword similar to his original gold sword. The pommel appears to be a purple gemstone with a tiny pink gemstone slit in the center. The hilt has good-condition leather grips on it. The sword itself is in very good condition. He obtained this sword in the episode "Morituri Te Salutamus."

Demon Sword
The Demon Sword first appears in the episode "Dad's Dungeon." In the episode, Finn and Jake go to Joshua's Dungeon to retrieve Jake's family sword. At the end of the dungeon Finn finds it encased in locks and stone, he breaks it loose and uses it to fight the final monster of the dungeon. The sword is made out of Demon Blood, which causes Blood Demon to sporadically appear and plead to "Joshua" (Jake) for the return of his blood. Blood Demon is easily banished away using the spell "Kee Oth Rama Pancake." Finn said that he would keep the sword at the end of the episode, and it has been seen in three episodes since. In "Return to the Nightosphere," Finn spins it in front of the blood mist cloud and hits Marceline with it while under the impression she is Hunson Abadeer. In "Daddy's Little Monster," Finn can be seen holding it throughout the video files on Jake's "new video phone." In "Beyond this Earthly Realm," Finn uses it to slash one of the Heads from the Head Spirit. In "Gotcha!" he uses it to save Lumpy Space Princess from the Mirror Finns. Jesse Moynihan and Adam Muto said this will replace the Root Sword.

Dagger
Finn was holding a twisted, yellow dagger found outside the windmill when he and Jake approach the "monster" in the episode "The Monster." As this has been the weapon's only appearance to date, little else is known about it. It resembles a kriss, an Indonesian dagger considered to posses magical powers.

Dual sword
While Finn was under the "control" of Fight King in the episode Morituri Te Salutamus, he fought with a sword that was completely split apart from the tip of the blade to the pommel. When Finn was forced to fight Jake, he only used one sword.

Adult Sword
In Mortal Folly when Finn, Bubblegum, and Jake meditate, Finn shows in his imagination that he is grown up. Finn is shown to have a new sword in a sash. However it is not confirmed that Finn will use this sword as he gets older due to this being in his imagination.

Pink Jewel Sword
In "Slow Love" there is a sword with a hilt pointed on both sides and a pink gem on the bottom.The sword is seen slicing Finn's bed in half. It is unknown if Finn actually uses the sword in battle or that it's simply part of the decor in his bedroom.

Dungeon Sword
In "Dungeon" Finn obtained a sword from the dungeon but was melted by lava when Princess Bubblegum returned. Not much of it is seen because it was dark.

Thief City Dual Sword
Finn steals two swords in the episode, "City of Thieves" but are taken by two angels at the end

Ice Ninja Sword
When Finn and Jake earn ninja skills in "The Chamber of Frozen Blades" Finn obtains a ninja sword using his ninja skills. It was never seen again since Finn and Jake did not want to memorize the ninja skills.

Trivia

 * In reality, a sword made entirely of 24-karat gold would be a very poor weapon, as pure gold is extremely soft and malleable by nature. A gold blade would stand no chance against steel. Furthermore, gold is very heavy, which would make Finn too sluggish to fight efficiently. Although it is possible that the sword is a gold alloy, gold-plated, or painted gold, gold in itself is a terrible choice for blade-smithing.
 * The Gold Sword may in fact be enchanted. As seen in "The Silent King", "The Eyes," and "Business Time " it has the ability to deflect fire, ice and lightning magic.
 * The Root Sword may have been a gift from Jake, since he planned the "murders" aboard the Mystery Train and knew that Finn's Gold Sword was destroyed in "The Real You ."
 * Finn never used the root sword to battle The Lich, this was because The Lich's only known weakness (before entering his Lair) was The Gauntlet of the Hero Billy.
 * The sword in the Adventure Time logo has never been shown being used, other than in the promo video.
 * The yellow twisted dagger Finn used looks similar to Me-Mow's dagger.
 * Fionna (the gender swapped version of Finn) has a Crystal Sword; however, she most likely has other swords, like Finn does.
 * The house Finn lives in has several swords strewn around it, though Finn and Jake never use these. They are possibly just for display.