I stick closely to the structure of the myths. I may have some fun with the mythology by changing the environment to modern-day, but the structure of the myths, the monsters, the relationships of the gods - none of that is made up.
Rick RiordanNeither torch nor dagger," Annabeth said firmly. "There is a third test, which I will pass." "A third test?" the pater demanded. "Mithras was born from rock," Annabeth said, hoping she was right. "He emerged fully grown from the stone, holding his dagger and torch." The screaming and wailing told her she had guessed correctly. "The big mother knows all!" a ghost cried. "That is our most closely guarded secret!" Then maybe you shouldn't put a statue of it on your altar, Annabeth thought.
Rick Riordan