Complex sentence: Fiends is a term used in the "Dungeons & Dragons" fantasy role-playing game to refer to any malicious otherworldly creatures, including various races of demons and devils, that are of wholly of evil alignment and hail from the Lower Planes.
Split into simpler sentences: Fiends is a term used in the "Dungeons & Dragons" fantasy role-playing game to refer to any malicious otherworldly creatures within the Dungeons & Dragons universe. These include various races of demons and devils that are of an evil alignment and hail from the Lower Planes.