This is a very dark piece. There is no white light in it. I'm making this very clear so there is no misunderstanding.
His name is Calthoo and he does it all. There is not a lot to say about him other then that except that he will protect you in anyway that is needed.
Calthoo MUST be activated in order to work but it is easy and takes all of 10 minutes. Once you activate him he will only listen to you. If you want to make him unable to work or put him into deep sleep you may do that. You would also want to do that if you pass him on.