hello i had the exact same poblem with this on my pc version, what you need to do is reload the game back to when you first found the moth preist, in the cave, in that force field, and when you make him your fiend, you need to make sure he is not hostile when you do that, because he will continue to be hostile to everyone he meets, so go back and calm him first then control him, this should help as it did for me.