Apocalypse Arm

 is Robo's strongest Mechanical Arm in, exclusive to the DS release of the game. Found in a chest in the Dimensional Vortex (Future). Ordinarily modifying attack by zero points, Apocalypse Arm deals 9,999 damage with each successful critical hit. This weapon has a critical hit rate of 10%. Equipping the Rage Band adds an additional 50% the critical hit rate score and increases the potential that this weapon will achieve its special effect when worn by Robo. Additionally, the Dragon's Tear accessory, while exclusive to, also grants bonuses to critical hit, making it a desirable pair for this weapon as well.

Name Origin
The is a major geologic catastrophe following the  in Jewish and Christian traditions. Also, interestingly enough, Robo is from a time period rendered desolation by an apocalyptic catastrophe that occurred in the year 1999 A.D. in the Keystone Timeline.