Special
The special tab gather some less used actions like the hidden message, change department and code.
Hidden message: can be used if you want to change a bot and define an exact block the user can start from or also to save some specific comments in your backend.
Change department: is an action strictly related to human agent handoff. In the case you have several department that can manage user conversation basing different rules you can set your department in the admin section of your project and then choose one in your bot basing specific criteria. Check how to set your department.