Mystic Character is a term used to describe a character in literature or mythology who has supernatural powers and knowledge. The term can also refer to a person who is believed to possess such powers. In crosswords, the term is often abbreviated to 'RUNE, ' which is a four-letter word. Runes are symbols that were used in ancient times to represent letters, words, and ideas. They were believed to have magical properties and were used for divination and protection.