The Mercurial Ring is one of the new Unique Rings found in the Diablo: Hellfire expansion, and is found randomly. Rogues and to a lesser extent, Monks will benefit from it the most. Its name is obviously a reference to the god Mercury, known for his speed and winged feet.
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The Mercurial Ring
Diablo I Unique Rings — Bramble • Ring of Regha • The Bleeder • Empyrean Band • Ring of Truth • Ring of Engagement • Constricting Ring
Hellfire Unique Rings — Giant's Knuckle • Ring of Thunder • Ring of Magma • Ring of Mystics • Karik's Ring • Xorine's Ring • Gladiator's Ring • Mercurial Ring