The concept..."as distinguished from a description, explanation, or illustration".
A description of the drow, or a picture, or an explanation...these things would fall under copyright law. And copyright also extends to non-literal elements, using the "abstraction-filtration-comparison" test to analyze non-literal infringement.
Whether copying the drow would be an infringement or not really depends on what exactly you copy. If you create a race which is exactly like the D&D drow (including the identical culture, religion, physical and magical traits, etc), then you could potentially run into problems. You'd also have to be very careful to avoid infringing trademarks, which do protect names.
And please note it's copyright - the right to make copies - not copywrite.
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