The phrase "angel of darkness" is often used to describe a sinister or evil presence. There are many synonyms that can be used to convey this type of meaning, including "demon," "devil," "Maleficent," "shadow," "darkness," "nightmare," "phantom," "specter," "ghost," "witch," "sorceress," "vampire," and "monster." Each of these words can evoke a sense of fear or dread, and they can be used to describe a range of dark and malevolent characters in literature, film, and mythology. When seeking to describe a character or situation that is foreboding and sinister, one of these synonyms for "angel of darkness" may be particularly effective.