'pray' or 'pray (for) <something>'
Many things may happen when praying at different places, or for different names of things, livings or even unlivings. But the only usefulness of it commonly known is perhaps when you are a ghost and need a body.
This usually would happen after a death, or quitting during announced anarchy (although only if you've voted yes and entered the tournament).
In some areas, most noticably the ones where death tends to act differently from Larstown, the 'pray' command might not cut it, or atleast you will have to find the location in which it might function. This is especially true in larger domains like Amril and Reikland, where Death doesn't reap you, just leave you in a ghost state at your location of death.