D&D adventure

You take your great ax and slice it right into the monsters neck. The fat monster’s head was took straight off his shoulders. You run to the chest curious to why the monster was guarding it. When you open it you see it’s a huge, purely golden key. You think of were it could go to and remember that the doors had a key slot. You get back to the beginning were the doors were and try, at first you here a click, then another and another until the door open wide open without you even touching it.you scream "YES!" Your free!!! just watch out for birds.