81 Relief heretofore available by common law writs

Here's a plain-English summary:

If you needed to ask a court to force a government official or agency to do something they're legally required to do, stop them from doing something they don't have the power to do, or challenge someone's right to hold a public office, you used to have to use special old legal tools with names like "mandamus," "prohibition," "scire facias," or "quo warranto." These were separate, formal types of lawsuits with their own strict rules.

This rule gets rid of the need to use those old-fashioned labels and procedures. Instead, you can now get the same kind of help by simply filing a regular lawsuit, called an "original action," in the right court. The legal protections and remedies these old writs used to provide still exist. You just don't have to jump through the old hoops or use the old names to get them.

In short, this rule modernizes the process. It means people don't need to know Latin legal terms or follow outdated formal steps to challenge government action or an improper officeholder. They can use standard court procedures to ask for the same kind of relief.