The second command, that you use to sending some Sworn Sword in some adventure, is adventure. Moreover, this command is used to send your Sworn Sword to the adventure, that you specify in the command , and with the action selected.
play/adventure/123456789?action_name=fight&symbol=the_neck_3
where 123456789 is the Sworn Sword identification number, fight is the action you select and the_neck_3 is the adventure that you want to do.
The Sworn Sword identification number and the adventure name are explained in the post about the first command.
About the action, you have nine options: fight, harass, aid, spy, sabotage, steal, barter, bribe and hoodwink.
Don't use swindle! Use hoodwink instead.
Answer from the server
You will receive a JSON file where the more important field is: cooldown. This field give you the time you need to wait until the adventure finishes. There is others fields we will explain later.