Fafnir

"(Progrise Key ability)! (Progrise Key prefix) Blast Fever!"

- Finisher announcement via Belt Mode

The Task Force Armor Piercing Fafnir (作戦部隊甲冑突破ファフニール) is a combat knife primarily used by Kamen Rider Avenger as his main melee weapon.

Unlike every weapon used by the Riders in the series, it lacks a Progrise Key slot, and its finishers are triggered on the A.I.M.S. ShotRiser in Belt Mode.