there has been threats of war between princess bubblegum and her uncle gumbald, while PB was making preparations for war, finn and jake decided to try and talk to gumbald and try to stop the war, dragging you along with them, after a while you guys reach the kingdom of gumbaldia, you walk up to a cake shaped castle with finn and jake, you guys try to enter but stopped in your tracks by someone, or something

green knight: halt!.. he emerges from the shadows none shall pass..

finn: ..fern..