Hi there,

I had delusions that this office building my neighborhood was the headquarters of a secret organization of magic users. I was also magical, and the protector of my neighborhood. They were out to destroy me and my neighborhood. This delusion lasted approximately five years. I don't know what helped me or why it went away. What I do know is that all of my friends were aware of it and never tried to help me. But I believed it was true 100% and even if they had tried to help, I probably would not listen at that time. However, now, I would be greatful if someone had cared.

So, I don't know how to convince him to get help, but it surely does sound like he needs to see a psychiatrist. Only a psychiatrist can diagnose properly for mental illness.