This command is similar to Ask the Oracle, except that instead of rolling a single Oracle, it pops up a window that will let you roll multiple related Oracles together to generate a new Entity. You can choose to roll all fields indicated as "first look" fields in the rulebook and/or you can roll individual fields. You can also choose whether to write the results into a new file representing that Entity. In any event, the rolls you choose will be logged in an oracle group node in your journal.
You can also execute this command by clicking on the button with a die icon that appears when you open a category in the Sidebar's Oracles Tab.
Only some Entities are currently supported, with more being added over time.