The term 'Diabolical Type' is used to describe someone who is a FIEND, or a malicious and cruel person. This type of person is often characterized by their evil and wicked behavior. They are usually seen as a villain or an antagonist in stories and films. The term 'FIEND' is derived from the Latin word 'fendere' which means to hurt or injure. This term is often used to describe someone who is a source of great harm or suffering.