Medajaribur

The Medajaribur (メダジャリバー) is a sword that serves as Kamen Rider OOO's main weapon, given to him by the Kougami Foundation as a "birthday present". It can also be used to fire waves of energy to attack. By inserting three Cell Medals into the Medajaribur and scanning them with the O Scanner, it can be used to perform a Triple Scanning Charge attack called OOO Bash (オーズバッシュ). The OOO Bash appears to slice through not only the Yummy, but the fabric of reality itself, though anything other than the Yummy is restored afterwards. The name is a portmanteau of "medal" and Excalibur, the legendary sword from Arthurian myth.