Maltharian clergy are taught a special language during their religious education; a language of subtle hand-gestures and body language that would normally be ignored within common conversation. This language, known as Sharym (Hidden word), is how clerics can speak to others of their faith without revealing the message to others.
Originally created as a means of communication during long periods of silent observances, the clergy have taken it to a more subtle level and used it as part of their own rituals. When two Clerics of Maltharius would meet away from the kingdom, a series of gestures is used to test the other to ensure that they are truly Maltharian. One who is not of their faith who has managed to learn the language is given two choices; convert or die.
Rarely are they ‘successfully’ converted.