Peremptory Mandamus
Peremptory Mandamus: Dates from the 17th century. An absolute and unqualified command to the defendant to do the act in question. It is issued when the defendant defaults on, or fails to show sufficient cause in answer to, an alternative mandamus.
A peremptory writ of mandate, or mandamus, is a judicial writ (i.e. order) to any governmental body, government official, or lower court requiring that the they perform an act or cease to act where the court finds that an official law, duty or judgment requires them to do so.