Penitent Greaves is a Unique Boots. It can be used by any class.
The Penitent Greaves are a standout pair of boots updated in version 1.5, offering unique enhancements that make them highly valuable for certain builds, especially those centered around cold damage. These boots grant 125% movement speed and the new "unhindered" effect upon evading, allowing players to run through enemies for two seconds—ideal for escaping dangerous situations.
Additionally, they leave a trail of frost that chills and potentially freezes enemies, amplifying damage dealt to chilled foes by up to 25 times. The boots also provide critical strike chance against chilled enemies and significant bonuses to chill potency, making them perfect for cold-based characters like Sorceresses or Rogues. While they face competition from newer boots, Penitent Greaves remain a potent choice for builds focused on crowd control and cold effects.
Effect
You leave behind a trail of frost that Chills enemies. You deal [12 - 25]% more damage to Chilled enemies.
How to get Penitent Greaves
You can farm this unique from 
Grigoire, The Galvanic Saint
Remorseful devotees of the Cathedral of Light must undertake a grueling pilgrimage, journeying across the frigid glacier known as the Serac Rapture. Only then may their gravest sins be forgiven.
Legions
Helltide