Finn's swords

Finn's swords refer to the eight 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 sword was sent into the candy forest by the explosion it can be seen in Mortal Folly when Finn and Jake are chasing the lich 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."

Katana
Finn was shown to possess two gold-plated katana in the episode "Slow Love." These katana were never seen in another episode.

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."

Family Sword
Seen in the episodes "Dad's Dungeon", "Return To The Nightosphere", and "Daddy's Little Monster"In "Dad's Dungeon" Finn and Jake go off in Joshua's Dungeon to retrieve Jake's Family Sword. The sword is also made out of Demon Blood, which causes a demon to appear when Finn and Jake unsheath it. In "Dad's Dungeon" Finn said that he would keep the sword at the end of the episode. Finn also used this sword to fight the final monster of the dungeon. In "Return to the Nightosphere" Finn uses spins it in front of the Blood Mist Cloud. In "Daddy's Little Monster", Finn can be seen holding it throughout the video files on "Jake's New Video Phone." 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
In the episode Morituri Te Salutamus when Finn was under the control of Fight King he fought with a sword that was completely split apart from the tip of the blade to the pommel likely because it was designed that way or it belonged to the gladiator ghost Priscus and he was holding the sword up over his face when his head was split in half. When Finn was forced to fight Jake he only used one sword. He most likely did not elect to keep them as he already had two twin katana and decided to keep the steel sword even though he possessed the root sword at the time.



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.

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, unless you count 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.