Lena’s POV

Zephyrus sprinkled Annabeth’s magical silver dust to make us all invisible. The cave was enormous and we could easily walk in. We entered the cave cautiously but before we could reach the open door at the other side, a loud hiss made us stop.

We were instantly on our guard, knowing it was none other than Sergio. We stayed as quiet as possible to gauge the monstrosity of the creature. The walls of the cave vibrated as a giant serpent with huge fiery eyes slithered through the ...