Of all the classic movie monsters, I'm least familiar with the mythology of the mummy, but as I think about it now, it seems to be reflective of the golem in Jewish folklore. Each is raised into being by magic, unstoppable, on a singular mission, and nearly indestructible, and once they're let loos...
It was much better than the Angelic Player's Guide, as many of the mistakes made in the first book were fixed in this one.
The first book I ever edited. I think it really did capture the flavor of the setting, with a mix of serious, humorous, and epic artifacts.