The Lightning Thief
The Sea of Monsters
The Titan's Curse
The Battle of the Labyrinth
The Last Olympian
100

What is the other term for a demigod?

A Half-Blood

100

This satyr was kidnapped by a monster, and is forced to pretend to be a bride to stay alive. Who is he?

Grover Underwood.

100

This man was revealed in the first chapter to be a monster in disguise, hunting down demigods Bianca and Nico di Angelo.

Dr. Thorn, a manticore.

100

The leader of the quest into the labyrinth who was given the prophecy, a daughter of Athena.

Annabeth Chase.

100

Someone dies, sacrificing themself for Percy in the very first chapter. Who was this?

Charles Beckendorf, a son of Hephaestus.

200

What was revealed to be Grover Underwood's true form?

A satyr 

200

Circe claims that because of the lack of space on the island, she turns men (including Percy) into a smaller type of animal. What is this animal?

Guinea Pig

200

Who wasn't originally supposed to go on the quest to rescue Artemis and why?

Percy, since he is a boy.

200

How did Percy win a rock, paper, scissors battle with Briares, a 100 handed creature?

By doing a finger gun.

200

She is revealed to have become the next Oracle of Camp Half-Blood, a mortal introduced in the third book.

Rachel Elizabeth Dare

300

This God gets defeated by Percy during a fight on a beach shore

Ares

300

This child of Ares is supposed to be the leader of the quest to get the golden fleece from the Sea of Monsters.

Clarisse La Rue.

300

This antagonist is revealed to be the father of Lieutenant of Artemis, Zoƫ Nightshade.

Atlas, the Titan of Astronomy.

300

Although this person is mortal, she was a key component as to why Annabeth, Percy, Grover, and Tyson were able to get out of the maze. Who was this?

Rachel Elizabeth Dare.

300

Another traitor to Camp Half-Blood, a daughter of Aphrodite who was manipulated by Luke, who eventually sacrifices herself to help the demigod efforts.

Silena Beauregard 

400

Revealed in the Love Tunnel chapter, this is the common fear Annabeth has with her demigod siblings.

Arachnophobia, the fear of spiders.

400

The main antagonist of this book who kidnapped Grover, and was also a monster Odysseus fought in the Odyssey.

Polyphemus the cyclops

400

Before Bianca di Angelo died, she gives Percy a statue of a God who is missing from Nico's collection, and also revealing that this God is their Godly parent. Who is this God?

Hades

400

The God of the Wild dies in the middle of this book, leaving the responsibility of conserving nature to Grover. Who was this God.

Pan, God of the Wild.

400

Achilles helps Percy achieve invulnerability the same way he did, but how was this done?

By bathing in the River Styx

500

This person is revealed to be the traitor of Camp Half-Blood, who is working with the Titan Kronos.

Luke Castellan

500

What were the magical abilities of the Golden Fleece, and why was it needed for Thalia's dying tree?

It had incredible healing abilities, and it was thought it could cure the poison in Thalia's tree.

500

Why does Thalia Grace, daughter of Zeus, join the Hunters of Artemis?

So she can be eternally 15 years old, making it so she isn't the child of the Great Prophecy.

500

He is revealed to be the child of Athena mentioned in Annabeth's prophecy, the one who created the labyrinth.

Daedalus, or Quintus

500

"The hero's soul, cursed blade shall reap"

It was revealed that the hero said in this prophecy, was who?

Luke Castellan