Percy Jackson and The Nameless Deity: Ensemble of Fools

Percy Jackson is about to be kicked out of boarding school again. He can't seem to stay out of trouble. Is he supposed to stand by while a bully picks on his scrawny best friend? Or not defend himself when his teacher turns into a monster and tries to kill him?

Mythical creatures seem to be walking straight out of the pages of Percy's Greek mythology textbook and into his life. What's worse, he's angered a few of them:

Zeus's master lightning bolt has been stolen, and Percy is the prime suspect.

Percy and his friends Grover the satyr, and Annabeth, the demigod daughter of Athena, must find and return Zeus's stolen property and bring peace to a warring Mount Olympus. They travel cross country to the gates of the Underworld in Los Angeles, facing a host of enemies determined to stop them.

Well...that's the story we're acquainted with.

However, the world of mythology never stands by itself, and once Percy finds his true nature and starts questioning if the greek world is all it's showing itself to be, and that secrets lie beyond even the god's eyes, the plot that brews beneath the seams of reality starts to falter, and the greek world finds itself merging with a crueler, infernal world.

This is the Tale of a Cruel World, and of a Demigod who finds himself to be wrapped up with a being that could not be fathomed, even by a titan's eye.

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A Percy Jackson re-telling, merged with Terraria Calamity, specifially some of the fanmade expansions, namely Wrath of the Gods.

Starts at Chapter 20 of The Lightning Thief.