Fenrir

The Fenrir is a Keychain for Sora's Keyblade that appears in Kingdom Hearts II. The Fenrir is also one of the types of Keyblades left at the Keyblade Graveyard.

After defeating Sephiroth in Radiant Garden, Sora witnesses a battle between Cloud, Sephiroth, and Tifa. After Sephiroth and Cloud fly away in the middle of their duel, Tifa thanks Sora for his help and gives him the Fenrir Keychain.

Design
The Fenrir Keyblade, unlike all other Keyblades, takes on the appearance of a pin tumbler lock key, with bandages adorning the base of the blade similar to Cloud's Buster Sword. Its Keychain resembles Cloud's Fenrir pendant from his Final Fantasy VII: Advent Children outfit.

The Fenrir is named after the motorcycle ridden by Cloud in Final Fantasy VII: Advent Children, which also appears as a special Gummi Ship. The motorcycle is, in turn, named after Fenrir, a wolf summon which has appeared in multiple Final Fantasy games, in keeping with Cloud's wolf motif. Fenrir is the shortened name of the Norse wolf-god Fenrisulfr. In the Dissidia series, Cloud also gains his own version of the Fenrir as one of his weapons.

Whenever the Fenrir strikes a target, it emits beams of light and segmented stars that resemble those emitted by the Ultima Weapon.

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

The Fenrir is the only piece of equipment with the Negative Combo ability; in combination with the Negative Combo that Sora learns and a lack of equipped Combo Plus and Air Combo Plus abilities, Sora can attack with only combo finishers. This makes it essential for high scores in mini-games like Junk Sweep, Cargo Climb, and Phil's Training, which focus on the use of combo finishers. Furthermore, as bosses in Kingdom Hearts II cannot be defeated unless a combo finisher is successfully performed on them, the Fenrir is quite useful against bosses who tend to interrupt Sora's combos.

Other media
The Fenrir Keyblade is packaged with the Series 1 Play Arts Figures Valor Form figure.