That’s true.
The one going around and undoing the brainwashing was Rishia, and she may be considered the most important contributor.
What’s more, though we don’t know if it’s a hero’s weapon, she did obtain some form of 『Mysterious Projectile Weapon』.
“The Ivyred House will receive a financial reward, and Rishia and her parents will both receive the title of Baron separately.” (Queen)