Sacharissa Tugwood

The current Head of Slytherin was Sacharissa Tugwood, a famous Potioneer, who developed the Beautification Potion. She's currently teaching Potions class.

After hearing Clarisse's story, she thought for a while, then said: "Sorry, I'm also powerless. This problem can't be solved by regular ways..."

"You mean there is an irregular way that can solve it?"

"... Yes. But it's dangerous."

Clarisse said: "I can try everything."

"Ok. But I'm not sure this will work..."

Sacharissa told them that there were five legendary hidden rooms at Hogwarts School of Witchcraft and Wizardry. They were called Cursed Vaults, each vault shielded by a different curse placed on it, to protect the treasures inside. One of them was Vault of Memory, which held the power of controlling the memories and through it, altering the personalities.

"... No one has ever found even one vault, and most believed the Cursed Vaults to be nothing more than a legend. Even if you managed to find it, figuring out how to use its power is a hard and dangerous task."

After hearing this, Clarisse turned to the two of you and asked: "Can you help me, please?"

"Sure."

"Why not?"