Wisher

Wisher (夢想家) otherwise known as Dreamer (夢想家), was the Unique Skill awakened by Zenobia Corius. She obtained it after being blinded by her court physician Gustav in a plot to turn her into a vessel for Violet and mysteriously lost it after being cured by Rimuru Tempest.

Abilities
Wisher allows its user the ability to peer into the souls of people and discern their true nature as well as intentions. It allowed Zenobia to determine that "Rimuru" and the "Great Phantom Thief Satoru" were the same person after meeting both of them, as well as discover the ill intentions held against herself by Gustav.