>>48804779The ending Mori had planned originally involved their families as a rival group they neeed to stop, but the first adventures took long and scheduling became an issue to the point where Mori rushed the reveal of the families as antagonists and then never continued because it was hard to find time and there was tons of convoluted stuff to resolve.
When Mori decided to finally wrap up Mythbreakers and the others offered to play one more time she scrapped all of that and made a more simple finale vs the Wyrm so they could finish in one session.