Obsidian Ring of the Zodiac is a legendary ring in Diablo III. It requires character level 50 to drop. When it was reworked for Season Three (patch 2.2.0), it was a season-only drop; it now drops for all characters. Skills that have their normal resource cost removed for any reason—whether by a skill rune, Channeling Pylon, or item bonus—will not trigger this effect. For example, Blessed Shield will not trigger a cooldown reduction if Gyrfalcon's Foote is equipped, since the item bonus removes the Wrath cost of that skill.