[quote=@Zobozun]
<Snipped quote by Raineh Daze>

I was actually referring to Dante, who IIRC has sapient Devil Arms.
That being said, isn't having a character who cannot communicate and exists only to give your first character additional powers considered poor form?
[/quote]

It could communicate if it actually wanted to talk to you. It's an asshole, so it doesn't. Plus: canon part of the ending. It's an undead monstrosity that is also basically a pet.