Bianca's ribbon
From Dragon Quest Wiki
The Bianca's ribbon is an accessory in Dragon Quest V. Bianca gives it to Saber and after he and the hero depart Roundbeck with Pankraz. When worn, it increases wisdom by 10 points, making it helpful for monster recruits that have low wisdom scores. This ribbon is also needed to recruit Saber from within Scary Lair, in order for him to remember who the hero is.