While I am a fan of Japanese mythology it might seem out of place in Daventry, but could be usable in King's Quest as the basis for another realm to visit. Also, I think at this point drawing from Tolkien has been done to death.
I finally built a working time machine! It's not perfect yet though, it only moves forward in time and it's a bit slow. You have to be in it for one second for every second you want to go into the future.