Like the Knockers of Cornish folklore they often help miners to the richest veins of ore or other treasures by their peculiar knocking sound. They appear dressed in miniature mining outfits, work constantly but never finish their task. They are said to be half a yard (1.5 ft) tall, very ugly, but often friendly and helpful.
Coblynau are mentioned in the Constantine episode "The Darkness Beneath", but the description of the creatures given is closer to knockers.
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