The Ring of Regha is a Unique Ring from Diablo I which is found randomly. Sorcerers will benefit from it somewhat more than the other classes.
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Ring of Regha
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