Something important that hasn't been mentioned is the reason they were called Slave to begin with. In the Japanese version of the game, weapons contain flavor text which has been left out in the Global version. For the Slave weapons, the text is: ''A sealed devil weapon from an early era. The user's hardships will call the power of destruction sealed within.''

In any case yes, censorship of video games sucks and I stopped playing the game. Not entirely because of the censorship but it was a significant enough reason.