I want to run a D&D campaign where the big villain is a lich bard. He was originally a bard but he became a lich so he'd have centuries to perfect his poetry. His massive villainous scheme is to manipulate cultures over centuries, starting wars and introducing cultural shifts and destroying whole kingdoms of people. His ultimate goal, though, is just to change how the Common language is pronounced, so that he can find a word to rhyme in one of the stanzas of his poem.