Pandemonium

Pandemonium is an event which took place during the Grand Magic Games arc.

Prologue
The third day of the X791 Grand Magic Games arrives and the event of the day is announced to be called "Pandemonium" and the participating teams are asked to choose a representative. From Team Fairy Tail A, Erza Scarlet offers to go while Cana Alberona goes for Team Fairy Tail B, having come to fill the spot for Mystogan, who cannot afford to be seen due to the presence of Lahar, a member of the Magic Council who happens to be the special guest judge of the day. In the audience is Doranbolt, who Lahar asked to come with him. Having seen Erza come out for her team, Millianna eagerly requests to be the representative for Team Mermaid Heel, which Kagura allows. Obra is chosen for Team Raven Tail while Hibiki goes for Team Blue Pegasus. Orga goes for Team Sabertooth while the Guild Master of Lamia Scale orders Jura Neekis to represent their team. Finally, Nobarly is chosen to represent Team Quatro Puppy.

The referee returns (claiming he had the day off for day two) and shows the competitors the setting; a giant building where monsters live. He explains that the monsters inside are classed from D to S. However the D class monsters are quite tough, which everyone sees via a video monitor of a monster smashing a statue. The referee claims the battle power goes up for stronger monsters and can even rival that of a Wizard Saint. The rules of the game are simple, each competitor will go in one by one and fight a number of monsters for points. They can select how many monsters the will fight thanks to the Challenge Right but are warned that monsters they get will be randomized. When asked what happens if they lose, the judge states that their previous victories will still be counted but the current round will be null and voided. The game is set go on until all 100 monsters are defeated or everyone's magical power runs out.

In order to decide who goes first, numbers are drawn by each participant. Erza draws #1, meaning she gets to go first, while Cana draws #8. When asked how many monsters she wishes to fight, Erza states that she will fight all 100 at once. Despite being warned against it, she proceeds into the building, ready to fight.

Battle
Erza, all alone, takes on every single monster in Pandemonium. She sustains countless wounds and runs out of magical power to the point that she is no longer able to summon her armors. However, in the end, she manages to defeat all the monsters and raises her sword in victory, to the happiness of her guild.

Aftermath
The rest of the team comes down and greets her, congratulating her on her performance and thanking her for what she's done. As a result of her overwhelming victory, Erza earns her team 10 points.

As everyone revels in Fairy Tail's strength, the problem remains that the other contestants have no way of determining ranks. To solve this problem, a device known as the Magic Power Finder is brought out and is announced to be part of the next event.