You can use other speciality pens, like calligraphy pens, for line drawing. These sorts of pens have specifically made nibs generally used for hand lettering techniques. The Crow Quill helps make the thinnest traces I understand of outside of a Rapidograph. It's got a scratchy experience and makes it possible https://riverchiih.ampedpages.com/ink-drawing-for-beginners-no-further-a-mystery-62826743