Who is Melchior from Lamb: The Gospel According to Biff and what is their importance?

Melchior is the third Magus that Joshua and Biff visit. He lives in a cave overlooking the seacoast of India. Melchior teaches Joshua how to multiply food and other things that an enlightened Buddhist can do that seem miraculous. Another important teaching is the Divine Spark, which becomes the Holy Ghost in Joshua's sermons. The Magus tells Joshua that it is time to go back to Israel.