Illager spys.

If you walk into a woodland mansion with a white banner in your off hand you will be confronted by the evoker captain who will hand you a book and quill you must then sign it and then hand it back. You are now a spy, and you will travel to different villages, waiting for the perfect time to strike then you will blow the goat horn they gave you and it will summon a raid you will then lead the raid and have your own personal ravager mount.