From publisher blurb:
Legendary items are those that are picked up by the untested adventurers who eventually become heroes of the ages. Unlike traditional magical items, legendary items grow with the wielder, becoming more advanced as new abilities are unlocked over time. In this installment of the Psionic Items of Legend series is Dissonance, Wind of the Mind, a legendary weapon made of manacles and two crystalline orbs, used to fight against psionic creatures.
Within this short book you will find the history of Dissonance, the requirements to attune a character to it, and the abilities of it. In addition, the rules of legendary items are detailed.