Members of Dumbledore's Army would meet up in the Room of Requirement with Harry acting as their teacher.

"Make it a powerful memory - the happiest you can remember," Harry encouraged. "Allow it to fill you up. Keep trying, Seamus. George, your turn now."

"Expecto Patronum."

Nothing showed up, causing Fred to grin at his brother's failure from behind. Harry walked around the room in circles.

"A full-bodied Patronus is the most difficult to produce, but shield forms can also be equally useful against a variety of opponents."

Ginny produced a Patronus, smiling in delight and victory.

"Fantastic, Ginny!" Harry smiled widely. "Just remember, your Patronus can only protect you for as long as you stay focused. So focus, Luna. Think of the happiest thing you can. This is really advanced stuff, guys. You're doing so well."

Since childhood, Marisol didn't have many good memories. She loved her father dearly, but it was hard to take care of her right after her mother died. Marisol was a happy bundle of joy, but he was too stricken by death to properly pay attention to her. He asked his mother, Marisol's grandmother, to help out at the house. And so, a newborn Marisol was raised by her father and grandmother until he was ready to leave the nest.

Then, she learned she could see people's lives on countdown. She didn't know what it meant at first, so she would go around at her elementary school, saying "Your timer's going to go off soon." People were afraid of her and she didn't have friends. By the time she was accepted into Hogwarts, she learned not to mention the timers, but most people already knew of her gift. She made friends, but she didn't quite feel like she belonged until she met the Weasley twins.

"Expecto Patronum," Marisol whispered.

A flash emitted from the tip of her wand and a fox gracefully leapt around her body and ruffled its fur by wiggling about.

"What was your happiest memory, sweetheart?" Fred asked.

Marisol bashfully smiled. "Nothing you need to worry about."

The room of requirement began shaking as if a giant monster was headed toward them. Everyone turned to the door and the mirror shattered into shards. An explosion erupted and the door fully broke, debris everywhere.

"Get them," Umbridge ordered.