Mythmaker is a hackathon project that utilizes AI21 J1 to generate and continue stories based on user input. The project takes user input as a starting point and then uses AI21 J1 to generate a unique, imaginative story. Additionally, the project generates images related to each story, creating a visual representation of the story that the user can interact with. The goal of the project is to allow users to explore and create their own myths and legends through a fun and interactive experience.