Finn's swords

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

Gold Sword
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, becoming four-dimensional. Finn used the 4-D Gold Sword to attack the black hole he had created, which annihilated the blade. Finn is 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."

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.

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 grasslands 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. The Sword of the Dead has not appeared in any episode since. It is not known if he even kept it.



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. It's possible Finn could've realized that gold was not a good choice for swords and he opted for a steel sword. It's unknown if Finn will use this as his primary sword now. He obtained it in an earlier episode "Morituri Te Salutamus". He again used it in "Still".

Finn uses the the Root Sword against Me-Mow. It could be that Finn likes to use both.

Dagger
Finn was holding a twisted, yellow dagger found outside the windmill when they 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.

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 or even gold-plated, gold in itself is a terrible choice for bladesmithing.
 * The Gold Sword may in fact be enchanted. As seen in "The Silent King" and "The Eyes," it has the ability to deflect fire and ice 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 is never shown to be used.