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Sludge-covered Object is dropped from Black Bloods of Draenor and Draenor Blood Terrors in the Netherwing Mines of Shadowmoon Valley. After achieving friendly reputation with Netherwing and completing the quest  , Sludge-covered Objects have a substantial chance of containing the , which start the quest  .
The word "wonderous" in the comment is often mistaken as misspelled.