What is the ruling on a husband telling his wife, "You will not leave here except by divorce or death," intending to intimidate her? And does divorce occur if the wife stays overnight with her family due to urgent circumstances without anger?

If the husband limits himself to saying, "You will not leave here except by divorce or death," then there is nothing upon him if you leave, because this phrase does not include an immediate or a conditional divorce. Rather, it is a promise of divorce if you leave, and consequently, nothing is binding upon him if he does not fulfill his promise, and no divorce occurs by your staying with your family.