Manager keeps issuing threats

Hi Grapeviners! I am leaving an organisation I loved a lot because of a manager who is a bully, has 0 EQ ,micro manages and has no consideration for others. The manager constantly issues threats to my colleagues and me that he/she will ruin our careers incase a BGV comes up if we don't do as they say. I am in notice period and have asked to be released early. What do I do in a situation like this,since I continue to do my work sincerely but he/she has the power to decide when my last working day is.