The Crush Claw was a weapon that was merged with Thunder's arm. It was made of a hard, steel-like metal and was able to easily crush objects, yet only if it were merged with the user's arm, which would give it a direct and instant mind-link with the user, allowing commands to be sent to the claw on how much pressure the user wants it to have, how much force on an object, and several other things. It was originally crafted as a construction device on the planet Korus 19, but was stolen by Thunder, who was the first and only being to ever posess that Crush Claw (though there are others).