The fallen legend tells what happened before the actual treasure hunt.

One day at dusk. The Entertainer bard walks into a bar and starts to tell an adventure story that happened ten years ago.  The story begins with a group of adventurers planning to go back a thousand years to the fallen kingdom and find the last king’s treasure.  But even though they go back to the old time through magic, the overall plan never really finished for some reason.  Most people in the bar don’t believe that story because they think it’s unreal. But in the end, the elf, psychic, and bounty hunter come to the bar and want to restart the journey.