Fenrir

Fenrir is one of Sora's Keyblade in Kingdom Hearts II. After defeating Sephiroth in the Radiant Garden, Sora witnesses a battle between Cloud, Sephiroth, and Tifa. After Sephiroth and Cloud fly away into a duel, Tifa thanks Sora for his help and gives him the Fenrir keychain. It is the KHII equivalent of the Metal Chocobo and One Winged Angel.

The Fenrir Keyblade takes on the appearance of a pin tumbler lock key, with bandages adorning the base of the blade similar to Cloud's sword. In this, it is notably the only Keyblade with no "teeth". Its keychain resembles Cloud's wolf pendant from his Advent Children outfit (also a reference to the wolf-god, Fenrir).

Despite the passive ability of Negative Combo, the Fenrir Keyblade makes it up for its high attack power. It is also considered to be the strongest Keyblade available, even surpassing that of Ultima.

Fenrir is the only weapon with the ability "Negative Combo." This "Negative Combo" is special because it does not only subtract 1 ground move but also 1 aerial move, too. Combining Fenrir with Sora's "Negative Combo" ability is the only way to allow Sora to unleash a finishing move each time the attack command is executed. This is especially useful for the Twilight Town minigame in which Sora (or Roxas) uses the keyblade to destroy piles of junk.

Background
Fenrir is named after the motorcycle ridden by Cloud in Final Fantasy VII Advent Children, which is in turn named after the wolf-son of the Norse god, Loki. Fenrir has also appeared as a summon in multiple Final Fantasy games. It also bears a small resemblance to Cloud's sword from the original Kingdom Hearts.

Tips
Fenrir is a great help in the Hades Paradox Cup: Hades. It can increase the damage dealt to enemies especially around Round 41-50.

In Phil's training, you can equip both the Fenrir and the Negative combo ability for Sora to make it easier to meet the Jiminy Objective of 1000 points.

Other Appearances
The Valor Form edition of the Play Arts Figures comes packaged with Fenrir as one of the Keyblades.

The end clip in Kingdom Hearts II and Kingdom Hearts II: Final Mix+, The Gathering, features the Fenrir Keyblade as one of the many Keyblades stuck in the ground. Only this time, the Fenrir does not come with a keychain.