8 books in series

The Guardians

The Guardians is a 8-book series with 8 primary works first released in 1968 with contributions by K.A. Denver, Meljean Brook, Maggie Shayne, Marjorie M. Liu, Alyssa Day, and William Joyce.

Forest of Ancestors
Wild Thing
E. Aster Bunnymund and the Warrior Eggs at the Earth's Core!
Toothiana
Demon Bound
Jack Frost: The End Becomes the Beginning
Demon Marked
Guardian Demon